Is Your Vitamin D Too Low? 7 Symptoms Women Should Know and When to Get Tested

This article is for informational purposes only and does not constitute medical advice. Please consult a qualified healthcare provider for personalized guidance.

Feeling tired all the time? Dealing with muscle aches, bone pain, or weakness that does not have a clear cause? For some women, low vitamin D may be part of the picture. Vitamin D deficiency is common, but it can be easy to miss because the symptoms often overlap with stress, poor sleep, pregnancy, menopause, and everyday life. The strongest evidence links vitamin D deficiency to bone and muscle problems. Other symptoms, such as low mood or poor sleep, may also appear, but the evidence there is less clear.

Vitamin D helps the body absorb calcium and phosphorus, supporting healthy bones and muscle function. When levels stay too low for too long, adults can develop osteomalacia, a condition that softens bones and can cause pain, tenderness, and weakness. That bone-and-muscle role is where the evidence is strongest. This matters because vitamin D is often portrayed online as a cure-all, when the science is much more specific than that.

For women, this topic matters across life stages. Pregnancy changes nutrient needs. After menopause, bone loss speeds up. Limited sun exposure, darker skin, obesity, and conditions that affect nutrient absorption can all increase the risk of vitamin D deficiency. A careful, evidence-based approach helps distinguish what vitamin D deficiency is clearly known to do from what remains uncertain.

Symptoms at a glance

Vitamin D deficiency in women may show up as:

• Ongoing fatigue or low energy
• muscle weakness
• muscle cramps
• bone pain or tenderness
• back, hip, rib, or leg pain
• widespread aches or aches that are hard to pinpoint
• sometimes low mood or poor sleep, though these are less specific

These symptoms are common and can happen for many reasons. A blood test is the only way to confirm whether vitamin D deficiency is involved.

Why vitamin D matters for women’s health

Vitamin D helps keep calcium balance in a healthy range and supports normal bone remodeling. When vitamin D is low, the body absorbs less calcium from food. Over time, that can weaken bones and affect muscle performance. In adults, prolonged deficiency can lead to osteomalacia, characterized by weak bones and pain. The NIH Office of Dietary Supplements notes that serum 25-hydroxyvitamin D levels below 12 ng/mL are associated with deficiency, while levels of 20 ng/mL or more are sufficient for most people (NIH ODS, 2025).

For women, this becomes especially relevant when bone health is already under pressure. During pregnancy, nutritional demands rise. After menopause, lower estrogen levels speed bone loss. That does not mean every tired or achy woman has low vitamin D. It means vitamin D should be on the list of possibilities when symptoms and risk factors align.

Common vitamin D deficiency symptoms in women

Here is what those symptoms can look like in practice.

Fatigue that feels out of proportion

Many women with low vitamin D report feeling unusually tired, drained, or sluggish. Research suggests fatigue is a common complaint in people with a deficiency, but it is not specific. Anemia, thyroid disease, sleep disorders, depression, medication side effects, chronic stress, and many other conditions can also cause fatigue. That is why fatigue should be treated as a clue, not a diagnosis.

Muscle weakness

Muscle weakness is one of the more clinically meaningful signs. Women may notice weakness in the hips and thighs, such as finding it harder to climb stairs, get up from a chair, or stay steady on their feet. This fits with the known role of vitamin D in muscle function and with the clinical picture of osteomalacia in adults (Minisola et al., 2021).

Muscle cramps or aches

Some women experience cramping, soreness, or a heavy, achy feeling in the legs and body. These symptoms can happen with low vitamin D, but they can also happen with dehydration, certain medicines, overuse, electrolyte problems, and other health issues. Vitamin D deficiency should be considered in context, not assumed.

Bone pain, back pain, or tenderness

Bone pain is one of the most important symptoms to pay attention to. Vitamin D deficiency can lead to osteomalacia, which may cause deep, aching pain in the lower back, pelvis, ribs, hips, or legs (Minisola et al., 2021). People often describe it as a dull soreness rather than a sharp, injury-like pain. Persistent bone pain or pain accompanied by weakness warrants medical attention.

Widespread aches

Some women with low vitamin D describe aches that are hard to pinpoint. Research suggests that generalized aches can be part of the symptom pattern, but they remain nonspecific. These aches should open the door to a broader evaluation, not close the case.

Low mood or depressive symptoms

Some studies indicate that lower vitamin D levels are associated with depressive symptoms in certain groups of women, including healthy young women and pregnant women (Kerr et al., 2015). But this is an area where the wording matters. Observational studies can show an association, not proof of cause. Randomized trials of vitamin D supplementation for depression have shown mixed results (Guzek et al., 2023). The fairest summary is that low vitamin D may be one contributing factor in some women, not a proven standalone cause of mood symptoms.

Poor sleep or low energy

Poor sleep has been observed alongside low vitamin D levels in observational research, especially in pregnancy-related studies. But sleep problems are common and can result from hormonal changes, stress, caregiving, shift work, anxiety, depression, pain, and many other causes. Current guidance does not support treating poor sleep as a hallmark symptom of vitamin D deficiency.

Why are symptoms easy to miss in women?

Many symptoms linked to low vitamin D overlap with experiences women are often expected to push through: fatigue, body aches, poor sleep, mood changes, and pain. These symptoms may be dismissed as stress, caregiving strain, postpartum recovery, the transition years before menopause, or just getting older. That can delay testing when a deficiency is actually present. Getting a straight answer matters, and so does being taken seriously.

There are also equity issues to consider. Women who work indoors, live in northern climates, cover much of their skin for cultural or religious reasons, have darker skin, or have limited access to fortified foods and routine healthcare may have fewer chances to prevent or identify deficiency early. The NIH notes that greater melanin levels reduce the skin’s ability to produce vitamin D from sunlight (NIH ODS, 2025).

Who is more likely to be deficient?

According to the NIH Office of Dietary Supplements, groups at higher risk of inadequate vitamin D status include older adults, people with limited sun exposure, people with dark skin, people with conditions that limit fat absorption, and people with obesity or a history of gastric bypass surgery (NIH ODS, 2025). These are not guarantees of deficiency, but they do raise the odds.

For women, two life stages deserve special attention.

During pregnancy

Pregnancy increases nutritional demands, and the 2024 Endocrine Society guideline suggests routine vitamin D supplementation, even without testing first, because it may help lower the risk of a serious high blood pressure complication in pregnancy called preeclampsia, pregnancy loss, preterm birth, babies being born smaller than expected for their stage of pregnancy, and newborn death (Demay et al., 2024). The same guideline suggests against routine 25-hydroxyvitamin D testing during pregnancy in otherwise healthy pregnant people. In the trials reviewed for the guideline, vitamin D doses ranged from 600 to 5,000 IU daily equivalent, with a weighted average of about 2,500 IU per day. This does not mean every pregnant person should self-prescribe that dose. It means routine supplementation without prior testing is supported, while routine blood testing is not.

Some observational research also suggests low vitamin D may be associated with perinatal depressive symptoms, but that evidence still shows correlation rather than proof of causation (Yuan et al., 2024).

After menopause

After menopause, bone health becomes a more urgent concern because estrogen levels drop and bone loss speeds up. The European Menopause and Andropause Society position statement reports that vitamin D deficiency in postmenopausal women is associated with low bone mass and higher fracture risk (Anagnostis et al., 2023). At the same time, it does not support using vitamin D as a treatment for hot flashes or as a strategy to prevent cardiovascular disease or cancer. That is a useful reminder that vitamin D matters most where the evidence is strongest: bone and muscle health.

How vitamin D deficiency is diagnosed

Vitamin D status is measured with a blood test called serum 25-hydroxyvitamin D (25(OH)D). The NIH Office of Dietary Supplements identifies this as the main marker of vitamin D status. Levels below 12 ng/mL are associated with deficiency, levels from 12 to less than 20 ng/mL are generally considered inadequate, and levels of 20 ng/mL or more are sufficient for most healthy people (NIH ODS, 2025).

Routine screening is not recommended for everyone. The USPSTF says there is insufficient evidence to assess the balance of benefits and harms of screening asymptomatic, community-dwelling, nonpregnant adults (USPSTF, 2021). The recommendation applies to adults with no signs or symptoms of deficiency and no conditions for which vitamin D treatment is already recommended. In other words, if you have symptoms such as bone pain or muscle weakness, or risk factors that increase the likelihood of deficiency, an individual evaluation can still make sense.

What current guidance says about supplementation

The 2024 Endocrine Society guideline states that healthy adults younger than 75 generally should follow the Recommended Dietary Allowance rather than routinely take extra vitamin D for disease prevention (Demay et al., 2024). For adults younger than 70, that is 600 IU daily. For adults aged 70 and older, the recommended dose is 800 IU daily. The guideline does recommend routine supplementation for some groups, including pregnant people and adults over 75. It also suggests against routine 25(OH)D testing in healthy adults.

This is an important nuance. General intake guidance is not the same as treatment for a confirmed deficiency. If someone is truly deficient, especially if symptoms are present, the right dose may be different and should be guided by a clinician.

Food sources and sunlight

Vitamin D is naturally present in only a small number of foods. Good sources include fatty fish such as salmon, trout, sardines, and tuna, as well as egg yolks and beef liver. Many foods are also fortified with vitamin D, including milk, some plant milks, breakfast cereals, and orange juice. Checking the nutrition label can help.

Sunlight also helps the body make vitamin D, but it is not a reliable solution for everyone. Season, latitude, skin tone, age, clothing, and time spent indoors all affect how much vitamin D the skin can produce. “Just get more sun” is too simple for many women’s real lives and health contexts.

When to talk with a clinician

It is a good idea to speak with a healthcare professional if you have:

• Ongoing fatigue that does not improve
• muscle weakness or repeated muscle cramps
• bone pain or tenderness
• frequent falls or worsening balance
• digestive conditions that affect absorption
• a history of bariatric surgery
• pregnancy plus persistent fatigue or low mood
• postmenopausal bone concerns or fracture risk

These symptoms do not automatically mean low vitamin D, but they are worth evaluating in context.

One important caution: more is not always better

Vitamin D is essential, but high-dose supplementation is not harmless. The NIH states that vitamin D toxicity is almost always caused by excessive supplement use, not by sunlight (NIH ODS, 2025). Toxicity can lead to high calcium levels, kidney problems, calcification of soft tissues, and, in severe cases, an irregular heartbeat. That is why self-prescribing high doses without testing or medical advice is risky.

Practical takeaways

Vitamin D deficiency in women often does not look dramatic. It may show up as fatigue, muscle weakness, muscle cramps, bone pain, or widespread aches. Those symptoms are real, but they are also common and not unique to vitamin D deficiency.

The strongest evidence links low vitamin D to bone and muscle problems. Evidence for mood or sleep effects is more mixed, so those symptoms are better treated as possible clues than proof.

Women who are pregnant, postmenopausal, older, have darker skin, live with obesity, get little sun exposure, or have conditions that affect absorption may be more likely to have low vitamin D.

A blood test is the only way to confirm a deficiency. Symptoms alone are not enough.

FAQ

Can vitamin D deficiency make women feel tired?

Yes, it can. Fatigue is commonly reported among people with low vitamin D levels, but it is not specific and can occur for many other reasons as well.

Is depression a sign of low vitamin D?

Possibly, but the evidence is mixed. Some studies show an association between low vitamin D and depressive symptoms, but that does not prove vitamin D deficiency causes depression.

Should all women get tested for vitamin D deficiency?

Not routinely. The USPSTF says there is insufficient evidence to recommend for or against screening asymptomatic, community-dwelling, nonpregnant adults. Testing is usually more helpful when symptoms or risk factors are present.

Can I start high-dose vitamin D on my own?

That is not a good idea. Too much vitamin D can be harmful, and the right dose depends on your age, health status, pregnancy status, and lab results.

What foods are highest in vitamin D?

 Good food sources include fatty fish such as salmon, trout, sardines, and tuna, as well as egg yolks and beef liver. Many foods are also fortified with vitamin D, including milk, some plant milks, orange juice, and breakfast cereals.

Save this article — then bring it up with a qualified healthcare professional if you have been feeling unusually tired, weak, or achy and have risk factors for low vitamin D. A simple conversation can help you decide whether testing makes sense and what next steps are right for you.

This article is for informational purposes only and does not constitute medical advice. Please consult a qualified healthcare provider for personalized guidance.

References

Anagnostis, P., Lambrinoudaki, I., Stevenson, J. C., Goulis, D. G., & Pérez-López, F. R. (2023). EMAS position statement: Vitamin D and menopausal health. Maturitas, 169, 2–9. https://doi.org/10.1016/j.maturitas.2022.12.006

Demay, M. B., Pittas, A. G., Bikle, D. D., Diab, D. L., Kiely, M. E., Lazaretti-Castro, M., Lips, P., Mitchell, D. M., Murad, M. H., Powers, S., Rao, S. D., Scragg, R., Tayek, J. A., Valent, A. M., Walsh, J. M. E., & McCartney, C. R. (2024). Vitamin D for the prevention of disease: An Endocrine Society clinical practice guideline. The Journal of Clinical Endocrinology & Metabolism, 109(8), 1907–1947. https://doi.org/10.1210/clinem/dgae290

Guzek, D., Kołota, A., Lachowicz, K., Skolmowska, D., Stachoń, M., & Głąbska, D. (2023). Effect of vitamin D supplementation on depression in adults: A systematic review of randomized controlled trials. Nutrients, 15(4), 951. https://doi.org/10.3390/nu15040951

Kerr, D. C. R., Zava, D. T., Piper, W. T., Saturn, S. R., Frei, B., & Gombart, A. F. (2015). Associations between vitamin D levels and depressive symptoms in healthy young adult women. Psychiatry Research, 227(1), 46–51. https://doi.org/10.1016/j.psychres.2015.02.016

Minisola, S., Colangelo, L., Pepe, J., Diacinti, D., Cipriani, C., & Rao, S. D. (2021). Osteomalacia and vitamin D status: A clinical update 2020. JBMR Plus, 5(1), e10447. https://doi.org/10.1002/jbm4.10447

National Institutes of Health, Office of Dietary Supplements. (2025, June 27). Vitamin D: Fact sheet for health professionals. https://ods.od.nih.gov/factsheets/VitaminD-HealthProfessional/

U.S. Preventive Services Task Force. (2021, April 13). Recommendation: Vitamin D deficiency in adults: Screening. https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/vitamin-d-deficiency-screening

Yuan, Y., Qu, L., Sun, Q., He, P., & Zhou, X. (2024). The association between vitamin D deficiency and perinatal depression: A systematic review and meta-analysis. Alpha Psychiatry, 25(6), 669–675. https://doi.org/10.5152/alphapsychiatry.2024.241553