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Vitamin D deficiency symptoms

Vitamin D deficiency symptoms therapy

Vitamin D, often referred to as the "sunshine vitamin", plays a crucial role in our overall health. It is not only important for bone health, but also for our immune system, mood regulation and many other bodily functions. Despite its importance, vitamin D deficiency is surprisingly common across all age and demographic groups. In this article, you'll learn more about vitamin D deficiency symptoms, why it can be harmful and what you can do to prevent or treat it.

But what exactly is a vitamin D deficiency?

Vitamin D deficiency is a condition that occurs when the vitamin D level in your body is too low. Vitamin D is a unique vitamin that your body can produce when your skin is exposed to sunlight.

Vitamin D plays several important roles in your body. It helps the body absorb calcium and phosphorus from food, which is important for bone and tooth health. Vitamin D also supports the immune system, the brain and the nervous system. It regulates insulin levels, supports lung function and cardiovascular health, and influences the expression of genes involved in cancer development.

A vitamin D deficiency can be harmful for several reasons. First and foremost, it can lead to bone diseases such as osteomalacia (soft bones) or osteoporosis (brittle bones). It can also lead to a weakened immune system, making you more susceptible to disease. Vitamin D deficiency has been linked to depression, fatigue, muscle weakness and even an increased risk of death from cardiovascular disease. In children, it can lead to severe asthma and rickets - a disease that causes soft, weak bones.

Maintaining adequate vitamin D levels is therefore crucial for your overall health and well-being. If you suspect a deficiency, you should definitely get tested and, if necessary, take steps to increase your vitamin D levels - either through more sun exposure, diet or supplements.

Vitamin D deficiency symptoms

Common vitamin D deficiency symptoms

Vitamin D deficiency can be gradual and symptoms may not appear immediately. However, if left untreated, it can lead to various health problems.

General vitamin D deficiency symptoms

  • Muscle pain
  • Pain in the bones
  • Tingling in hands or feet
  • Weakness of the muscles
  • Frequent illnesses or infections
  • Tiredness and fatigue
  • Bone and back pain
  • Depression
  • Impaired wound healing
  • Bad mood
  • Little energy
  • States of anxiety

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Typical vitamin D deficiency symptoms with a small deficit

Mild to moderate vitamin D deficiency can lead to fatigue, bone and muscle pain and a general feeling of malaise. Some people may also experience depression and anxiety, as vitamin D plays a crucial role in mood regulation.

Severe vitamin D deficiency

In severe cases of vitamin D deficiency, the symptoms can become more serious. In children, it can lead to rickets, a disease in which bone tissue is not properly mineralized, resulting in soft bones and skeletal deformities. In adults, it can lead to osteomalacia and osteoporosis, conditions characterized by softening of the bones and an increased risk of fractures, respectively.

Affected risk groups for a vitamin D deficiency

Certain population groups have a higher risk of developing a vitamin D deficiency due to various factors. These risk groups include:

Older adults

With increasing age, the skin's ability to produce vitamin D in response to sunlight decreases. They may also spend more time indoors and do not eat enough vitamin D-rich foods.

People with limited sun exposure

People who live in northern latitudes or in areas with high levels of air pollution, who work night shifts or jobs that prevent sun exposure, or who wear clothing that covers most of the skin are at risk due to the limited sun exposure the body needs to produce vitamin D.

People with darker skin

Melanin, the pigment that gives the skin its color, reduces the skin's ability to produce vitamin D from sunlight. Therefore, people with darker skin have a higher risk of vitamin D deficiency.

Overweight people

Vitamin D is a fat-soluble vitamin, i.e. it is extracted from the bloodstream by fat cells, which alters its release into the bloodstream. People with a high body mass index (BMI) tend to have low levels of vitamin D in their blood.

Infants who are breastfed

Although breast milk is the best source of nutrients for infants, it may not provide enough vitamin D.

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Measures to combat vitamin D deficiency

If you suffer from symptoms of vitamin D deficiency, there are several measures you can take to increase your vitamin D levels:

Going into the sun

The most natural way to get more vitamin D is to expose your skin to sunlight. It is recommended to get 10-30 minutes of midday sun on your face, arms, back or legs several times a week without sunscreen. However, excessive sun exposure can lead to skin ageing and skin cancer, so it is important to find a balance between sun exposure and skin protection.

Diet with foods rich in vitamin D

Certain foods are good sources of vitamin D. These include oily fish (such as salmon, mackerel and sardines), cod liver oil, egg yolk, cheese and beef liver. Some foods are fortified with vitamin D, e.g. some dairy products, orange juice, soy milk and cereal products.

Food supplements

If it is difficult to get enough vitamin D from sunlight and food, you can consider taking a vitamin D supplement. The amount needed may vary depending on age, health and lifestyle, but in general an intake of 1000 IU (25 micrograms) per day is sufficient for most people.

Regular physical activity

Regular physical activity, especially outdoors, can boost the body's own vitamin D production.

Mountain tour hiking

The most important points on vitamin D deficiency & symptoms summarized

Vitamin D deficiency is a common health problem that can have a significant impact on overall health. Here you will find a summary of the most important information on vitamin D deficiency:


Symptoms of vitamin D deficiency can be subtle but can include fatigue, muscle weakness, bone pain, mood swings and frequent illness or infection. A severe deficiency can lead to conditions such as rickets in children and osteomalacia or osteoporosis in adults.


Vitamin D deficiency can be caused by a variety of factors, such as limited sun exposure, dark skin, older people, being overweight or obese, and certain health conditions that affect the absorption of vitamin D from food.


Treatment for vitamin D deficiency usually consists of increasing vitamin D intake through diet, supplements and sunlight. Foods rich in vitamin D include oily fish, cheese, egg yolks and fortified foods such as milk and cereals. Supplements are often recommended for those who cannot get enough vitamin D from sunlight and food.

Final thoughts and advice

Vitamin D plays a crucial role in many aspects of health, from bone health to immune function. Therefore, maintaining adequate vitamin D levels is important for overall health. If you are at risk of vitamin D deficiency, you should have your vitamin D levels checked regularly and take steps to increase your vitamin D intake if necessary. This could mean spending more time outdoors, changing your diet or taking supplements.

Prevention is always better than cure. Therefore, knowing the risk factors and symptoms of vitamin D deficiency can help individuals take preventative measures and seek early treatment to achieve better health outcomes.

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663,33  / l

QMEGA (Omega 3)


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  • Parva, Naveen R. "Prevalence of Vitamin D Deficiency and Associated Risk Factors in the US Population (2011-2012)." Link
  • Office of Dietary Supplements - Vitamin D. National Institutes of Health. Link
  • Wright, Kenneth P Jr, et al. "Influence of sleep deprivation and circadian misalignment on cortisol, inflammatory markers, and cytokine balance." Brain, Behavior, and Immunity, vol. 47, 2015, pp. 24-34. link
  • The Biology of the Immune System. National Center for Biotechnology Information. Link
  • "Vitamin D: How much is enough?" ASBMB Today, American Society for Biochemistry and Molecular Biology. Link


The images were purchased under licence from Canva.

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