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Your exposure to sunlight is limited. Because the body makes vitamin D when your skin is exposed to sunlight, you may be at risk of deficiency if you are homebound, live in northern latitudes, wear long robes or head coverings for religious reasons, or have an occupation that prevents sun exposure. You have dark skin.
Low vitamin D levels can be found in people of all age group including small babies and the elderly. Some of the most common symptoms of low vitamin D are fatigue, muscle pain, joint pain, weight gain, headache, constipation or diarrhea, high blood pressure, etc. There are several factors that can contribute to this problem. Following are some of the prevalent causes of low vitamin D in the human body. â Lack of Exposure to Sunlight. The inner layer of the skin produces vitamin D using sunlight. If one does not have enough sun exposure, he or she may develop vitamin D deficiency.