Vitamin D Deficiency in Women: Symptoms & When to Test

Vitamin D Deficiency Symptoms in Women: Signs, Causes and When to Seek Advice

Feeling unusually tired, struggling with muscle aches or noticing persistent back pain can make you wonder whether you are getting enough vitamin D.

Vitamin D deficiency is worth understanding, particularly for women living in the UK, where sunlight is not usually strong enough for the body to produce adequate vitamin D during autumn and winter.

What are the signs of vitamin D deficiency in women? Low vitamin D often causes no noticeable symptoms. When deficiency becomes more severe, it can contribute to bone pain, muscle weakness, aches and difficulty with everyday movements such as climbing stairs. Tiredness may also occur, but it is not specific to vitamin D deficiency.

Women do not have an entirely different set of deficiency symptoms from men. However, pregnancy, limited sunlight exposure and concerns about bone health after menopause can make vitamin D particularly relevant at different stages of life.

If your main concern is getting enough vitamin D during the colder months, our UK guide to vitamin D in autumn and winter explains the seasonal recommendations.

Below, we look at the symptoms that deserve attention, common misconceptions, who may be at greater risk, when blood testing is appropriate and how to follow UK vitamin D advice safely.

What Does Vitamin D Do in the Body?

Vitamin D helps the body regulate calcium and phosphate, two minerals needed for normal bones, teeth and muscles.

It also contributes to the normal functioning of the immune system.

The body can make vitamin D when skin is exposed to sunlight, but production varies with the season, skin pigmentation, clothing, time spent outdoors and other factors.

Vitamin D is also present in a relatively small number of foods and can be supplied through supplements.

When vitamin D levels become too low, calcium absorption and normal bone mineralisation can be affected. Severe deficiency can lead to osteomalacia, a condition in which adult bones become soft and painful.

That is why persistent bone pain and muscle weakness deserve more attention than a general claim that vitamin D causes every symptom from tiredness to changes in skin appearance.

What Are the Most Important Vitamin D Deficiency Symptoms in Women?

It helps to separate symptoms associated with significant vitamin D deficiency from general complaints that can have many other causes.

1. Persistent bone or back pain

Bone pain is one of the more important symptoms associated with severe vitamin D deficiency.

It may be felt in the lower back, hips, pelvis, thighs or other bones.

In osteomalacia, the bones become softer because normal mineralisation is affected. This can cause discomfort and tenderness.

However, back pain is extremely common and can be caused by posture, muscle strain, arthritis and many other conditions.

Back pain alone does not mean you have low vitamin D. Persistent or unexplained pain should be assessed rather than automatically treated with supplements.

2. Muscle weakness

Vitamin D is important for normal muscle function.

Significant deficiency can contribute to muscle weakness, particularly in the muscles around the hips and thighs.

You might notice that activities which were previously straightforward feel more difficult.

Examples include:

• Climbing stairs
• Getting out of a low chair
• Walking longer distances
• Standing up from the floor

Muscle weakness can have many medical causes, so persistent or progressive weakness deserves proper assessment.

3. General aches and muscle discomfort

Some people with vitamin D deficiency report general aches, muscle discomfort or cramps.

These symptoms can be difficult to distinguish from those caused by other nutritional, muscular or medical problems.

For that reason, general aches are best considered alongside your overall health, exposure to sunlight and any more specific symptoms.

4. Feeling tired all the time

Tiredness is often one of the first symptoms people associate with low vitamin D.

But fatigue is not a reliable way to diagnose a vitamin D deficiency.

Poor sleep, iron deficiency, thyroid disorders, stress, some medications and other health conditions can all contribute to feeling tired.

That means taking vitamin D without understanding the cause may not address the actual problem.

If tiredness is affecting your daily life, a GP can assess your symptoms and decide whether any investigations are appropriate.

5. Bone weakness and increased fracture risk

Long-standing, significant vitamin D deficiency can affect bone health.

Vitamin D helps the body absorb calcium, which is essential for maintaining normal bones.

In severe cases, inadequate vitamin D may contribute to osteomalacia, while poor bone health more generally can increase susceptibility to fractures.

A fracture following a relatively minor injury is a reason to seek medical assessment rather than relying on an over-the-counter supplement.

Are Vitamin D Deficiency Symptoms Different in Women?

The main symptoms of significant vitamin D deficiency are broadly similar in women and men.

What differs is the health context.

For women, three life stages or circumstances deserve particular consideration.

Vitamin D during pregnancy and breastfeeding

Vitamin D is important during pregnancy because it helps support normal bone and tooth development.

NHS guidance recommends 10 micrograms of vitamin D daily during autumn and winter for pregnant women, with year-round supplementation relevant for those who have limited sunlight exposure or other risk factors.

If you are pregnant, already taking a pregnancy multivitamin or have concerns about your vitamin D intake, check with your midwife or GP before adding another supplement.

Important: Pregnancy supplements require particular care. Products containing vitamin A in the form of retinol should generally be avoided during pregnancy unless specifically advised by a healthcare professional.

Vitamin D after menopause

Bone health becomes especially important after menopause.

Changes in oestrogen levels can accelerate bone loss, which contributes to the increased risk of osteoporosis in postmenopausal women.

Vitamin D helps maintain normal bones through its role in calcium regulation, but it is only one part of bone health.

Calcium intake, appropriate physical activity, other medical risk factors and, where necessary, osteoporosis assessment also matter.

Vitamin D supplements alone should not be presented as a complete prevention or treatment strategy for osteoporosis.

Vitamin D for women with limited sunlight exposure

Women who spend much of the day indoors or routinely wear clothing covering most of their skin may produce less vitamin D through sunlight.

This can make consistent attention to vitamin D intake more important, regardless of age.

The same applies to many people with darker skin, including those from South Asian, African and African-Caribbean backgrounds.

Can Vitamin D Deficiency Cause Hair Loss, Low Mood or Weight Gain?

These questions appear frequently in online searches, but they need careful answers.

Hair loss

Some research has examined relationships between vitamin D levels and certain hair-loss conditions.

However, hair shedding and thinning have many possible causes, and hair loss is not a reliable standalone sign of vitamin D deficiency.

Taking vitamin D does not guarantee that hair will grow back.

Low mood

Studies have explored associations between vitamin D status and mood, but an association does not establish that low vitamin D is the cause of low mood in an individual.

Vitamin D supplements should not be treated as a substitute for assessment or treatment of depression.

Weight gain

Low vitamin D levels and higher body weight can occur together, but this does not prove that vitamin D deficiency causes weight gain.

Vitamin D supplementation should not be promoted as a weight-loss treatment.

The practical takeaway: If you have persistent hair loss, low mood, unexpected weight changes or ongoing fatigue, investigate the actual cause rather than assuming vitamin D is responsible.

Who Is Most at Risk of Vitamin D Deficiency in the UK?

Vitamin D deficiency can affect anyone, but certain people may have a greater risk of not getting enough.

These include:

• People who rarely go outdoors: Including those who work indoors, are housebound or spend most of their time inside.
• People who cover most of their skin outdoors: Clothing can reduce the skin's exposure to sunlight.
• People with darker skin: More melanin can reduce vitamin D production from a given amount of sunlight.
• Older adults: Reduced mobility and limited outdoor activity can increase the likelihood of inadequate vitamin D intake or production.
• People with conditions affecting nutrient absorption: Certain digestive or medical conditions may affect vitamin D absorption or metabolism.
• People using certain medications: Some medicines can affect vitamin D status or bone health.

If you have a health condition affecting nutrient absorption, take regular medication or have previously been diagnosed with deficiency, your needs may differ from general supplement advice.

When Should You Get Tested for Vitamin D Deficiency?

A vitamin D blood test measures a substance called 25-hydroxyvitamin D, often written as 25(OH)D.

It can help a clinician assess vitamin D status when testing is medically appropriate.

However, routine testing is not recommended for every healthy adult simply because they live in the UK or feel tired occasionally.

According to NICE guidance on vitamin D, healthcare professionals should generally reserve testing for people with symptoms suggesting deficiency, particularly high risk or another clinical reason.

For example, your GP may consider testing if you have:

• Persistent bone pain or tenderness
• Unexplained muscle weakness
• Possible osteomalacia
• Certain bone-health concerns
• Medical conditions that increase the risk of deficiency
• Other clinical reasons that make testing useful

Different laboratories and clinical situations may use different interpretations of vitamin D results. It is therefore more useful to discuss the result with your healthcare professional than to self-diagnose from an online chart.

How Much Vitamin D Do Women Need in the UK?

For general nutritional needs, UK guidance recommends a vitamin D intake of 10 micrograms (400 IU) per day for adults.

During autumn and winter, adults should consider taking a daily vitamin D supplement containing that amount.

Some people with limited sunlight exposure are advised to consider taking vitamin D throughout the year.

The NHS also advises adults not to take more than 100 micrograms (4,000 IU) of vitamin D per day unless a healthcare professional has recommended a different amount for a clinical reason.

That upper limit is not a target dose. Taking more vitamin D than you need does not automatically improve your health.

You can review the official recommendations in the NHS vitamin D guidance.

What Is the Difference Between Preventing and Treating Vitamin D Deficiency?

This distinction is particularly important when choosing a supplement.

A daily supplement containing 10 micrograms of vitamin D is commonly used to help people meet general nutritional recommendations.

Someone with confirmed, significant vitamin D deficiency may need a different dose or treatment plan prescribed by a healthcare professional.

The right approach depends on clinical circumstances, including the severity of deficiency and any underlying medical conditions.

Do not assume that taking several additional vitamin gummies is an appropriate way to treat a diagnosed deficiency.

If you use more than one supplement, our guide to how many vitamin gummies to take a day explains why checking overlapping nutrients is important.

How Can Women Get Enough Vitamin D?

There are three main sources of vitamin D: sunlight, food and supplements.

1. Sunlight

From around late March or early April to the end of September, most people in the UK can make vitamin D when their skin is exposed to sunlight.

Between October and early March, the sunlight is generally not strong enough for adequate vitamin D production.

However, this does not mean deliberately staying in strong sunlight or risking sunburn is a good idea.

Protecting your skin from excessive UV exposure remains important.

2. Food

Vitamin D occurs naturally in relatively few foods.

Sources include:

• Oily fish such as salmon, sardines and mackerel
• Egg yolks
• Some fortified breakfast cereals
• Some fortified spreads
• Other foods with vitamin D added during manufacturing

Check packaging rather than assuming every milk, yoghurt or cereal product is fortified with vitamin D.

Getting all your vitamin D from food alone can be difficult, particularly during the UK winter.

3. Supplements

Vitamin D supplements are available in several forms, including tablets, capsules, drops, sprays and gummies.

The most appropriate format depends on the amount of vitamin D provided, the ingredients and your individual preferences.

If you prefer chewable supplements, Yumi All Day Energy Gummies currently contain 10 micrograms of vitamin D2 per recommended two-gummy serving.

They also contain vitamins A, C and E, along with other nutrients.

That makes them one possible option for adults looking for a daily multivitamin format, but they are not a treatment for diagnosed vitamin D deficiency.

Because the formula contains vitamin A, anyone who is pregnant should seek advice about a suitable pregnancy-specific supplement rather than assuming a general multivitamin is appropriate.

For more information about gummy formats, read our Vitamin D Gummies: Effectiveness, Dosage and Safety Guide.

How Long Does It Take to Recover From Vitamin D Deficiency?

There is no fixed recovery period that applies to everyone.

How quickly vitamin D levels improve can depend on:

• The starting vitamin D level
• The dose prescribed or recommended
• How consistently treatment is taken
• Individual absorption and metabolism
• Other health conditions

When treatment is needed, blood levels may take weeks or months to improve.

Some people feel better after correcting deficiency, while others may notice little change if their symptoms have another cause.

Your healthcare professional can advise whether follow-up testing is necessary.

Can You Have Low Vitamin D Without Any Symptoms?

Yes.

Vitamin D deficiency can be present without obvious symptoms, particularly in less severe cases.

This is one reason UK guidance focuses on preventive supplementation for people at risk and during the colder months, rather than waiting for symptoms to appear.

However, being at risk does not automatically mean you need a blood test or high-dose treatment.

For many otherwise healthy adults, following the general supplement guidance is the more appropriate starting point.

Frequently Asked Questions

What are the first signs of vitamin D deficiency in women?

Many women notice no symptoms at all. When symptoms do occur, they may include general tiredness, aches or muscle weakness. More significant deficiency can cause bone pain and difficulty with everyday movements. These symptoms are not unique to vitamin D deficiency.

What does low vitamin D feel like?

There is no single feeling that reliably identifies low vitamin D. Some people experience no noticeable symptoms. More severe deficiency may be associated with bone pain and muscle weakness.

Can low vitamin D make women feel tired all the time?

Tiredness can occur alongside low vitamin D, but it has many possible causes. Persistent fatigue should be assessed rather than automatically attributed to a vitamin deficiency.

Can vitamin D deficiency cause leg pain?

Significant deficiency can contribute to bone pain, including pain in the legs or pelvis. However, leg pain has many possible causes, and ongoing or unexplained pain needs appropriate medical assessment.

Can vitamin D deficiency cause hair loss in women?

Some studies have found associations between vitamin D status and certain hair conditions, but hair loss is not a reliable way to diagnose vitamin D deficiency. Supplementation does not guarantee hair regrowth.

Can vitamin D deficiency affect women after menopause?

Vitamin D remains important for normal bone health after menopause. However, postmenopausal bone loss is influenced by hormonal changes and other factors, and vitamin D is only one part of maintaining bone health.

Should pregnant women take vitamin D?

UK guidance recommends 10 micrograms daily during autumn and winter for pregnant women, and year-round supplementation may be appropriate depending on sunlight exposure and individual circumstances. Ask a midwife or GP which supplement is suitable.

How do doctors check vitamin D deficiency?

When clinically appropriate, healthcare professionals use a blood test measuring 25-hydroxyvitamin D. Routine testing is not generally recommended for every healthy adult.

Is 10 micrograms of vitamin D enough?

Ten micrograms, equivalent to 400 IU, is the general UK recommendation for daily vitamin D intake for adults. Someone with a medically diagnosed deficiency may need a different treatment dose.

Should I take vitamin D every day in winter?

UK guidance recommends that adults consider taking a daily 10-microgram vitamin D supplement during autumn and winter because sunlight is generally insufficient for vitamin D production at that time of year.

Is vitamin D2 or vitamin D3 better?

Both can contribute to vitamin D intake. Vitamin D3 may raise or maintain blood vitamin D levels more effectively in some circumstances, but the appropriate dose, product formulation and individual needs matter. People treating a confirmed deficiency should follow clinical advice.

Can taking too much vitamin D be harmful?

Yes. Excessive vitamin D supplementation can lead to high calcium levels in the blood and serious health problems. Adults should not exceed 100 micrograms (4,000 IU) daily unless directed by a healthcare professional.

The Bottom Line

Vitamin D deficiency is worth understanding, particularly during the UK autumn and winter and for women with limited sunlight exposure or concerns about bone health.

But not every episode of tiredness, hair shedding or back pain is caused by low vitamin D.

The most important symptoms of significant deficiency are persistent bone pain, muscle weakness and problems related to bone health. Many people with low vitamin D have no obvious symptoms at all.

The best approach is to:

• Understand your individual risk factors
• Follow UK preventive vitamin D guidance
• Get vitamin D from appropriate food sources
• Check the vitamin D content of supplements you already take
• Seek medical advice for persistent or concerning symptoms
• Avoid treating a suspected deficiency with high-dose supplements without professional guidance

If you are looking for a convenient daily multivitamin, Yumi All Day Energy currently provides 10 micrograms of vitamin D2 in its recommended two-gummy serving.

You can also explore our guide to vitamin D during autumn and winter for practical UK seasonal advice.

Medical disclaimer: This article is for general educational purposes and is not a diagnostic guide. Food supplements should not replace a varied, balanced diet or medical treatment. Speak to your GP, pharmacist or midwife about persistent symptoms, pregnancy, existing health conditions, medication or suspected vitamin D deficiency.