Chronic Disease Management
General Health & Nutrient Deficiencies — Lab Review & Online Care
Tired all the time and not sure why. Lab results sitting in your portal that no one has explained. A feeling that something is a little off but nothing has been pinned down. A licensed healthcare provider can review your results and help you understand what your results may mean and what to do next.
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💊 General health and nutrient deficiencies — the things that often need more context
Iron deficiency, vitamin B12 deficiency, vitamin D deficiency, and anemia are common issues that may be identified during routine medical evaluation. When they show up on blood work, the response is often incomplete: a flagged result with a brief note to take a supplement, or no follow-up at all. No explanation of what it means. No plan for rechecking. No connection to how the person is actually feeling.
This page is for people who want an actual conversation about what their results mean, why they might be feeling the way they do, and what to do about it. A licensed healthcare provider can review your labs, connect symptoms to results, and help you build a plan — whether that means a specific supplement regimen, a prescription, dietary changes, or a referral for further workup.
What this page covers
Unexplained fatigue evaluation — understanding what may be driving low energy and identifying contributors worth investigating. Iron deficiency and iron deficiency anemia — the most common nutrient deficiency worldwide, and one that is often underdiagnosed. Vitamin deficiencies — particularly vitamin B12, vitamin D, and folate, which are commonly low and can have real effects on how you feel. Lab result review — help understanding what your blood work actually means and what to do next. This page does not cover severe or unexplained anemia, significant abnormalities involving multiple blood cell types, or conditions requiring hematology evaluation.
⚠️ Seek urgent or emergency care for any of these
Severe shortness of breath at rest, chest pain, or heart palpitations alongside fatigue or known anemia. Significant unexplained weight loss. Blood in the stool or vomiting blood. Jaundice (yellowing of the skin or eyes). Severe weakness or inability to carry out basic daily activities. These require prompt in-person evaluation and are not appropriate for telehealth management alone.
Condition deep-dive
😓 Unexplained fatigue — finding out what may be behind it
Fatigue is one of the most common reasons people visit a doctor, and one of the hardest to evaluate well because it has so many possible causes. Tiredness that does not improve with adequate sleep, low energy that affects daily life, or a general sense of feeling run down that never quite goes away — these are real symptoms worth investigating, not something to just accept.
Many causes of persistent fatigue can be identified through a combination of your medical history, symptoms, medication review, sleep and mental health assessment, physical examination when needed, and targeted laboratory testing. A provider can help you figure out where to start and which tests, if any, are worth running for your specific situation.
Some common contributors to persistent fatigue
- 🩸 Iron deficiency or anemia One of the most common causes of fatigue, especially in women of reproductive age. Your body needs iron to produce hemoglobin, which carries oxygen in red blood cells. When iron is low, less oxygen reaches your tissues, and even normal activity can feel exhausting. A complete blood count and iron panel can help evaluate this.
- 🌟 Vitamin B12 or folate deficiency B12 and folate are both needed to make healthy red blood cells and support nerve function. Deficiency in either can cause fatigue, weakness, and other symptoms. B12 deficiency is particularly common in older adults, vegetarians and vegans, and people taking certain medications like metformin or long-term proton pump inhibitors.
- ☀️ Vitamin D deficiency Significant vitamin D deficiency can contribute to bone pain and muscle weakness. Testing may be appropriate when a licensed healthcare provider identifies specific risk factors or clinical reasons to check it. Many people with low vitamin D levels have no symptoms at all.
- 🦋 Thyroid dysfunction An underactive thyroid (hypothyroidism) is a common and frequently overlooked cause of persistent fatigue, weight gain, feeling cold, and brain fog. A simple TSH blood test screens for this. See our Thyroid & Hormonal Conditions page for more.
- 🍬 Blood sugar dysregulation Prediabetes and diabetes can sometimes contribute to fatigue and other nonspecific symptoms. A1c and glucose testing may be appropriate based on your symptoms and risk factors.
- 😴 Sleep quality problems Poor sleep, insomnia, or undiagnosed sleep apnea can be the primary driver of fatigue even when medical labs are normal. If blood work comes back unremarkable but fatigue persists, sleep evaluation is an important next step. See our Neurologic, Sleep & Pain Management page for more.
- 🧠 Depression and anxiety Mental health conditions are a significant and commonly missed cause of physical fatigue, low motivation, and difficulty concentrating. These can coexist with other medical causes and should be part of a complete evaluation.
Note: MyPhysician360 does not place lab orders directly
If you do not have recent lab results, a provider can advise which tests may be worth pursuing for your situation and help you understand how to arrange them through your primary care clinician or a local laboratory. If you already have recent blood work, bring it to your visit — a provider can review existing results and connect them to your symptoms.
Tired of being tired without a real explanation? A licensed healthcare provider can help figure out what may be worth investigating.
Start a VisitCondition deep-dive
🩸 Iron deficiency and iron deficiency anemia — online evaluation and treatment
Iron deficiency is the most common nutritional deficiency globally, and iron deficiency anemia is the most common form of anemia. Symptoms develop gradually, which makes it easy to attribute low energy and other changes to other things. Many people live with iron deficiency for months or years before it is identified and treated.
Who is at higher risk for iron deficiency
- →Women with heavy menstrual periods — the most common cause in premenopausal women
- →Pregnant or postpartum women, due to increased iron demands — pregnancy-related concerns should be discussed with a prenatal healthcare provider
- →People who follow a vegetarian or vegan diet, since plant-based iron is less readily absorbed
- →People with gastrointestinal conditions that affect iron absorption (celiac disease, Crohn's disease, or after gastric bypass surgery)
- →Regular blood donors
- →Older adults, in whom GI blood loss from ulcers, polyps, or other sources is more common
- →Athletes, particularly runners, who can lose iron through foot-strike hemolysis and sweat
Symptoms of iron deficiency and anemia
- →Persistent fatigue and low energy, even after adequate sleep
- →Pale or sallow skin
- →Shortness of breath with activities that used to feel easy
- →Heart palpitations or awareness of your heartbeat
- →Difficulty concentrating or brain fog
- →Headaches
- →Brittle nails or hair loss
- →Unusual cravings for non-food items like ice, dirt, or starch (a symptom called pica)
- →Restless legs — an uncomfortable urge to move the legs, particularly at night
Iron deficiency without anemia — still worth evaluating
You can have depleted iron stores before your hemoglobin drops low enough to be classified as anemia. This is called iron deficiency without anemia, and it is a real clinical finding. Some people with confirmed iron deficiency without anemia experience symptoms such as fatigue or restless legs, and treatment may help when iron deficiency is contributing to those symptoms. A provider can review your results and help you understand whether treatment makes sense for your situation.
How iron deficiency and iron deficiency anemia are treated
- 🥗 Dietary changes Iron-rich foods include red meat, poultry, fish, beans, lentils, tofu, fortified cereals, and dark leafy greens. Pairing iron-rich plant foods with a source of vitamin C (citrus, tomatoes, bell peppers) improves how well non-heme iron is absorbed. Avoiding coffee, tea, calcium supplements, and antacids close to iron-rich meals also helps, as these can reduce absorption.
- 💊 Oral iron supplementation For most people with iron deficiency, oral iron supplements are the starting point. Various forms are available (ferrous sulfate, ferrous gluconate, ferrous bisglycinate, and others) with different tolerability profiles. GI side effects including constipation, nausea, and stomach discomfort are common with standard iron supplements. For some patients, every-other-day dosing may improve absorption and reduce gastrointestinal side effects compared with more frequent dosing. A provider can recommend the right form and dosing for your situation and help set realistic expectations: iron stores take weeks to months to replenish, and energy levels often begin to improve before levels fully normalize.
- 🔍 Finding and addressing the underlying cause Supplementation addresses the deficiency but not necessarily what caused it. New unexplained iron deficiency anemia in adult men and postmenopausal women warrants further evaluation for possible gastrointestinal blood loss or other causes, which may include upper and lower endoscopy based on clinical judgment. In premenopausal women with heavy periods, treating the underlying menstrual condition can significantly reduce ongoing iron losses. A provider can help determine whether the source of your iron deficiency is clear or needs further investigation.
When iron deficiency requires in-person or specialist evaluation
New iron deficiency anemia in an adult man or postmenopausal woman generally warrants evaluation for gastrointestinal blood loss, which may include upper and lower endoscopy based on clinical judgment. Severe anemia, anemia that is not responding to oral supplementation, or iron deficiency alongside other unexplained blood count abnormalities may require hematology evaluation or intravenous iron infusion, which is an in-person procedure. A telehealth provider can help assess your situation and direct you to the appropriate next step.
Condition deep-dive
🌟 Vitamin deficiencies — B12, vitamin D, and folate
Vitamin deficiencies can occur for many reasons, including diet, medications, medical conditions, and problems with nutrient absorption. Three come up frequently in primary care and are often well-suited to telehealth evaluation: vitamin B12, vitamin D, and folate.
- 💉 Vitamin B12 deficiency B12 is essential for nerve function, DNA synthesis, and the production of red blood cells. Deficiency develops slowly, often over years, because the body stores B12 for some time before depletion becomes clinically apparent. Symptoms can include fatigue, weakness, balance problems, tingling or numbness in hands and feet, memory difficulties, and mood changes. Severe or long-standing B12 deficiency can cause neurological complications that may not fully reverse, which is one reason early identification matters. Common reasons for B12 deficiency include a vegan or vegetarian diet (since B12 is found almost exclusively in animal products), a condition called pernicious anemia where the stomach loses the ability to produce a protein needed for B12 absorption, chronic use of certain medications including metformin and proton pump inhibitors, gastric bypass surgery, and older age. Borderline B12 results sometimes require additional interpretation or testing, particularly when symptoms or risk factors suggest deficiency. Treatment may involve oral or injectable vitamin B12 depending on the cause, severity, symptoms, and ability to absorb B12. Injections are commonly used for severe deficiency or significant malabsorption, although high-dose oral therapy may be appropriate for some patients.
- ☀️ Vitamin D deficiency Vitamin D plays an important role in bone and muscle health. Significant deficiency can contribute to bone pain, muscle weakness, and in severe cases, a bone-softening condition called osteomalacia. Many people with low vitamin D levels have no symptoms. Routine vitamin D testing is not recommended for every healthy adult, but testing may be appropriate when a licensed healthcare provider identifies specific risk factors or clinical reasons to check it. When supplementation is indicated, vitamin D2 and D3 can both raise vitamin D levels; your licensed healthcare provider can recommend an appropriate form and dose for your situation. Very high-dose supplementation over time carries a risk of toxicity and should be medically guided.
- 🥬 Folate (vitamin B9) deficiency Folate is a B vitamin found in leafy greens, legumes, citrus fruit, and fortified grains. It is essential for DNA synthesis and red blood cell production. Deficiency can cause a form of anemia called megaloblastic anemia, where red blood cells are abnormally large and do not function properly. Symptoms overlap with B12 deficiency: fatigue, weakness, mouth sores, and mood changes. Folate deficiency is particularly important during pregnancy, as it significantly increases the risk of neural tube defects in the developing fetus. This is why folic acid supplementation is recommended before conception and during early pregnancy; pregnancy-related nutritional concerns should be discussed with a prenatal healthcare provider. In non-pregnant adults, common causes include poor diet, heavy alcohol use, certain medications, and malabsorption conditions. An important nuance: folate deficiency and B12 deficiency can look very similar on blood work. Treating folate deficiency without identifying a coexisting B12 deficiency can mask B12-related neurological complications while they continue to worsen. Proper evaluation of both is important.
A word on supplement marketing
The supplement industry sells a wide variety of products promising to address fatigue, brain fog, immunity, energy, and general wellness. Some supplements are genuinely useful for confirmed deficiencies. Many others are not well-evidenced, may interact with medications, or may be taken at doses that are unnecessarily high or even harmful. More is not always better, and a supplement is unlikely to help symptoms caused by something other than the deficiency it is intended to correct. A provider can help you evaluate what you are already taking, identify what is actually supported by evidence for your specific situation, and flag any interactions or concerns.
Lab review and general health evaluation
🧪 Understanding your lab results — what common tests actually mean
A lot of people receive lab results through a patient portal without a proper explanation of what they mean. Numbers outside the reference range get flagged, but there is no context for how far outside, why it matters, or what to do. A licensed healthcare provider can review your existing lab results, explain what they mean in plain language, and help you understand whether action is needed and what that action should be.
Common labs we review and help you understand
- Complete Blood Count (CBC) Measures red blood cells, white blood cells, hemoglobin, hematocrit, and platelets. Used to screen for anemia, infections, and other blood disorders. Understanding what your hemoglobin and red blood cell size (MCV) suggest helps identify the type of anemia when one is present.
- Iron studies (ferritin, serum iron, TIBC, transferrin saturation) A full iron panel gives a much more complete picture of your iron status than a CBC alone. Ferritin is an important marker of the body's iron stores and is commonly used when evaluating iron deficiency. Because ferritin can also rise with inflammation or illness, providers interpret it alongside other findings when needed.
- Vitamin B12 and folate levels Borderline B12 results sometimes require additional interpretation or testing, particularly when symptoms or risk factors suggest deficiency. A provider can help put your result in context of your symptoms, history, and other lab findings.
- 25-hydroxyvitamin D (vitamin D level) The standard blood test for vitamin D status when testing is clinically indicated. Reference ranges vary by lab, and what constitutes deficiency, insufficiency, and sufficiency is interpreted differently by different guidelines. A provider can help you understand your result and whether supplementation is appropriate for your situation.
- Thyroid function (TSH, Free T4) Thyroid testing is frequently included in general health workups and is one of the most important screens for unexplained fatigue. See our Thyroid & Hormonal Conditions page for detailed information on thyroid results.
- Comprehensive metabolic panel (CMP) Covers kidney function, liver function, blood sugar, and electrolytes. Many mild abnormalities have benign explanations, while others warrant follow-up. A provider can help distinguish what is clinically significant and what is not.
- Hemoglobin A1c and fasting glucose Screening tests for diabetes and prediabetes. Because elevated blood sugar can contribute to fatigue and other nonspecific symptoms, these are often part of a general fatigue evaluation based on symptoms and risk factors. See our Heart & Metabolic Health page for more.
How online care can help
💻 What a telehealth visit for general health and deficiencies can do
Fatigue evaluation and lab review translate naturally to telehealth. A detailed conversation about symptoms, lifestyle, diet, medications, and existing lab results is the most important part of this kind of assessment — and that happens just as well through a video visit as in person.
| What a telehealth visit can do | What requires in-person or specialist care |
|---|---|
| Review existing lab results and explain findings in plain language | Lab testing — MyPhysician360 does not place lab orders directly; a provider can advise how to arrange testing |
| Evaluate symptoms of fatigue and identify contributors worth investigating | New iron deficiency anemia in a man or postmenopausal woman — warrants in-person GI evaluation |
| Advise on which follow-up tests may be appropriate for your situation | Severe anemia or multiple unexplained blood count abnormalities — may need hematology evaluation |
| Recommend and discuss iron supplementation regimens when appropriate | IV iron infusion — an in-person procedure for patients who cannot tolerate or absorb oral iron |
| Recommend appropriate vitamin D, B12, and folate supplementation based on labs and symptoms | Pregnancy-related anemia or nutrient deficiency — should be managed with a prenatal provider |
| Help distinguish which abnormal lab values are clinically significant vs. incidental | Suspected pernicious anemia or complex absorption conditions — may need GI specialist |
| Coordinate referrals to hematology, gastroenterology, or other specialists when needed | Significant unexplained weight loss, blood in stool, or jaundice — requires in-person evaluation |
Have labs already? A visit can start right there.
You do not need new testing to get value from a visit. If you have existing blood work, a provider can review what you have, connect it to how you are feeling, and recommend next steps. Bring results from the past 6 to 12 months if available, along with a list of current medications and supplements. That gives a provider a solid starting point without waiting for new labs.
What to expect
🗓️ Your visit, start to finish
Here is what a general health and deficiency visit looks like.
|
1
Share your symptoms and results
Describe how you have been feeling, how long it has been going on, and any lab results you already have. Include your current medications and supplements — both are important context. If you do not have recent labs, that is okay too. |
2
Talk with your provider
A licensed healthcare provider reviews your information, asks follow-up questions about diet, lifestyle, symptoms, and health history, and gives you an honest assessment of what may be contributing to your symptoms and what the most useful next steps are. |
3
Get a plan
Your provider explains findings, recommends specific supplements at appropriate doses when indicated, discusses dietary changes relevant to your situation, advises on whether additional testing is warranted, and helps you understand which findings need follow-up and which do not. Prescriptions may be sent to your pharmacy when appropriate. |
4
Follow up as things improve
Correcting deficiencies takes time, typically weeks to months before energy levels and lab values fully normalize. A follow-up visit to review lab trends and symptom progress is often worthwhile a few months after starting treatment. |
What to bring to your visit
Any recent blood work (CBC, iron studies, vitamin D, B12, thyroid, metabolic panel). How long you have been feeling the way you do and how it affects your daily life. Your current medications including any vitamins or supplements you are already taking. Relevant health history including any GI conditions, prior surgeries, dietary pattern, or heavy menstrual bleeding. The more context your provider has, the more useful the visit will be.
Care connected to your pharmacy
🏪 Your supplements and prescriptions. Your pharmacy.
Most supplements for iron, vitamin D, B12, and folate are available over the counter. Prescription-strength versions and specific formulations are available at pharmacies when clinically appropriate. When prescription treatment is indicated, your provider may send it electronically to the pharmacy you already use.
- ✓Prescriptions sent electronically to your selected pharmacy when clinically appropriate
- ✓Most supplement and deficiency treatments available as low-cost generics or OTC
- ✓Provider guidance on specific products, doses, and timing to maximize effectiveness
- ✓No required membership to access our telehealth services
Frequently asked questions
❓ Your questions answered
Can I get help with iron deficiency or anemia through telehealth?
Yes, in most cases. Iron deficiency and mild to moderate iron deficiency anemia are well-suited to telehealth evaluation when existing lab results are available. A licensed healthcare provider can review your blood work, connect it to your symptoms, and discuss appropriate treatment including supplementation, dietary changes, and whether further investigation is needed. If your situation involves new unexplained anemia or severe symptoms, in-person evaluation is the right starting point, and your provider will tell you that directly.
My labs show low ferritin but my hemoglobin is normal. Does that matter?
Ferritin is an important marker of the body's iron stores, and a low result indicates depleted iron even when your hemoglobin has not yet dropped. This stage is called iron deficiency without anemia. Some people with confirmed iron deficiency without anemia experience symptoms such as fatigue or restless legs, and treatment may help when iron deficiency is contributing to those symptoms. A provider can review your full results and help you understand whether treatment makes sense for your specific situation.
Can I just take iron supplements without seeing a provider?
For mild iron deficiency with a clear dietary cause and no concerning symptoms, trying an over-the-counter iron supplement is reasonable. That said, a provider visit adds value in a few ways: confirming that iron deficiency is actually the likely cause of your symptoms, recommending the right form and dose (since options vary significantly in tolerability and absorption), advising on timing and what to avoid taking close to your dose, and helping identify whether an underlying cause needs attention. In men or postmenopausal women, new iron deficiency should prompt evaluation for a source of blood loss before relying on supplementation alone.
What is the difference between iron deficiency and anemia?
Iron deficiency means your body's iron stores are low. Anemia means your hemoglobin level is below normal, which reduces your blood's ability to carry oxygen. Iron deficiency is the most common cause of anemia, but you can have iron deficiency without anemia (depleted stores but normal hemoglobin) or anemia caused by something other than iron deficiency. This is why a full iron panel, not just a routine blood count, gives a more complete picture when iron deficiency is suspected.
How long does it take to feel better after starting iron or B12 supplements?
Energy and symptoms often begin to improve within a few weeks of starting treatment, but fully restoring iron stores typically takes three to six months of consistent supplementation. B12-related symptoms, including nerve-related changes, can take months to improve and in some cases may not fully resolve if deficiency was prolonged. Retesting labs a few months after starting treatment helps confirm that levels are moving in the right direction and guides decisions about how long to continue.
I am taking a lot of supplements already. Is that a problem?
It can be. Many people take multiple supplements without a clear understanding of whether they need them, whether they are taking appropriate doses, or whether any interact with each other or with medications. Some supplements can interfere with drug absorption — iron and calcium both affect how levothyroxine is absorbed, for example. Very high-dose vitamin D over time carries a risk of toxicity. A provider can help you evaluate what you are taking, confirm what is actually supported for your situation, and flag anything that needs adjustment.
My lab result was flagged as abnormal but I feel fine. Do I need to do anything?
It depends entirely on what was flagged and by how much. Reference ranges are statistical constructs, and mild deviations are common and often have no clinical significance. Other abnormal results warrant follow-up even without symptoms. A provider can help you understand which category your result falls into, whether additional testing is needed, and whether active treatment or watchful monitoring is the right approach.
Is this visit HSA or FSA eligible?
MyPhysician360 visits may be HSA and FSA eligible. Check with your plan administrator to confirm based on your specific plan.
Helpful resources
📚 Learn more
Authoritative resources from leading health and nutrition organizations.
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🩸 Iron deficiency and anemia Iron Deficiency Anemia — Overview and Treatment National Heart, Lung, and Blood Institute Visit NHLBI → |
🌟 Vitamin B12 Vitamin B12 — Fact Sheet for Consumers National Institutes of Health — Office of Dietary Supplements Visit NIH ODS → |
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☀️ Vitamin D Vitamin D — Fact Sheet for Consumers National Institutes of Health — Office of Dietary Supplements Visit NIH ODS → |
🥬 Folate Folate — Fact Sheet for Consumers National Institutes of Health — Office of Dietary Supplements Visit NIH ODS → |
Your labs have something to say. Let's figure out what.
A licensed healthcare provider can review your results, connect them to how you have been feeling, and help you understand what to do next. No waiting room. No required membership. Available in most states.
HSA & FSA eligible — check with your plan administrator | No required membership
Medical disclaimer: The information on this page is for general educational purposes only and does not constitute medical advice. Fatigue, anemia, and nutrient deficiencies require individualized evaluation by a licensed healthcare provider. Severe shortness of breath, chest pain, significant weight loss, blood in the stool, or jaundice require prompt in-person evaluation. New unexplained iron deficiency anemia in adult men and postmenopausal women warrants further evaluation for possible gastrointestinal blood loss, which may include upper and lower endoscopy based on clinical judgment. Severe or complex anemia and unexplained blood count abnormalities may require hematology specialist evaluation. Treating folate deficiency without evaluating for coexisting B12 deficiency may mask B12-related neurological complications. Pregnancy-related anemia or suspected nutrient deficiency should be discussed with the patient's prenatal healthcare provider. Routine vitamin D screening is not recommended for all healthy adults; testing should be guided by clinical judgment. MyPhysician360 does not place laboratory orders directly. Prescribing decisions are made by a licensed healthcare provider on an individual basis. MyPhysician360 services are available in most states. Services are not currently available in Mississippi or Alaska.