Vitamin D Deficiency: Symptoms And Causes
Learn about vitamin D deficiency symptoms and causes, including limited sunlight exposure, dietary factors, absorption issues, risk factors, and when testing may be appropriate.
About This Topic
Vitamin D deficiency can occur when the body does not have enough vitamin D to support normal functions. Vitamin D helps the body absorb calcium and supports normal bone and muscle health.
Some people with low vitamin D may have no obvious symptoms. When deficiency becomes more significant, symptoms can include bone pain, muscle weakness, or general tiredness. These symptoms are not specific to vitamin D deficiency and cannot confirm a deficiency on their own.
What Is Vitamin D Deficiency?
Vitamin D deficiency means that vitamin D status is too low for the body's needs. Vitamin D can come from sunlight exposure, foods, and supplements. The amount produced or obtained can vary considerably between people.
Vitamin D is important because it helps the body absorb calcium. Together, vitamin D and calcium support normal bone health. Vitamin D also has roles in normal muscle and immune function.
Vitamin D Deficiency Symptoms
Bone Pain
More significant vitamin D deficiency can be associated with bone pain and disorders such as osteomalacia in adults. Bone pain can have many causes, so it should not automatically be attributed to vitamin D.
Muscle Weakness
Vitamin D deficiency can be associated with muscle weakness. Significant weakness that affects walking, climbing stairs, or getting up from a chair deserves medical evaluation.
Tiredness And General Symptoms
Some people report tiredness or general aches when vitamin D levels are low. However, tiredness is common and has many possible causes, including sleep problems, anemia, infections, medication effects, and other health conditions.
What Causes Vitamin D Deficiency?
Limited Sunlight Exposure
The body can make vitamin D when skin is exposed to ultraviolet radiation. Spending little time outdoors can reduce this source of vitamin D.
Limited Dietary Sources
Very few foods naturally contain substantial amounts of vitamin D. Dietary sources include fatty fish, egg yolks, and some other animal foods, while fortified milk, plant-based drinks, cereals, and other products can provide vitamin D when it has been added.
Problems Absorbing Vitamin D
Certain conditions that affect fat absorption can make it harder for the body to absorb vitamin D. Medical conditions, surgery, or other circumstances can therefore affect vitamin D status.
Other Individual Risk Factors
Vitamin D status can also be affected by age, skin exposure to sunlight, clothing that covers much of the skin, geographic and seasonal factors, and some medicines or medical conditions.
Who May Be At Higher Risk?
- People who spend little time outdoors.
- People with limited dietary sources of vitamin D.
- Older adults.
- People with conditions that affect nutrient absorption.
- People taking medicines that can affect vitamin D metabolism.
- People whose circumstances substantially limit skin exposure to sunlight.
Vitamin D Deficiency And Bone Health
Vitamin D helps the body absorb calcium, making it important for normal bone health. Severe or prolonged deficiency can contribute to disorders such as osteomalacia in adults and rickets in children.
Learn more about Vitamin D and Calcium.
How Is Vitamin D Deficiency Diagnosed?
Symptoms alone cannot establish vitamin D deficiency. When testing is appropriate, a healthcare professional can assess vitamin D status using a blood test and consider the person's symptoms, risk factors, medical history, and other relevant findings.
Can Food Help With Vitamin D Intake?
Food can contribute vitamin D, although relatively few foods naturally contain substantial amounts. Fatty fish are among the best natural food sources, while fortified milk, fortified plant-based drinks, fortified cereals, and selected other products can provide vitamin D when the nutrient has been added.
Explore Vitamin D Rich Foods, Vitamin D Foods, and Vitamin D Foods For Vegetarians .
When To Speak With A Healthcare Professional
Speak with a qualified healthcare professional if you have persistent bone pain, significant muscle weakness, ongoing symptoms, or concerns about your vitamin D status. Testing and treatment decisions should be based on individual circumstances rather than symptoms alone.
Frequently Asked Questions About Vitamin D Deficiency
What Are Common Vitamin D Deficiency Symptoms?
Significant deficiency can be associated with bone pain and muscle weakness. Tiredness and general aches may also occur, but these symptoms have many possible causes and do not confirm deficiency.
Can You Have Vitamin D Deficiency Without Symptoms?
Yes. Some people with low vitamin D levels may have no obvious symptoms. A healthcare professional can determine whether testing is appropriate.
Can Diet Cause Low Vitamin D?
A diet with limited vitamin D sources can contribute to low intake, although vitamin D status is also influenced by sunlight exposure, absorption, and other factors.
How Do You Know If You Have Vitamin D Deficiency?
Symptoms alone are not enough to confirm deficiency. When clinically appropriate, a healthcare professional can order a blood test to assess vitamin D status.
