Symptoms of lack of vitamin D include thin and brittle bones that fracture easily, muscle weakness, bone pain and difficulty in walking, states Healthline Networks. Lack of vitamin D leads to osteomalacia, which is associated with the risk of cardiovascular disease, cancer, autoimmune disorders and osteoarthritis.
Vitamin D helps the stomach absorb calcium and maintains the calcium and phosphate in blood that allows bones to form properly, notes Healthline Networks. Therefore, a lack of this vitamin leads to poor structural strength in bones. Muscle weakness in vitamin D deficiency occurs because of problems with attachment of muscles to bones, which may cause a waddling gait. Bone pain in vitamin D deficiency often starts in the hips and spreads to the pelvis, lower back, legs and ribs. Vitamin D deficiency is caused by problems in the absorption of Vitamin D, lack of sun exposure or problems with the diet, notes WebMD.
Medical conditions, such as celiac disease, certain types of cancer, and liver and kidney disorders, also cause lack of vitamin D, states Healthline Networks. Adults older than 65 and people with dark skin have a high risk of vitamin D deficiency, reveals Mayo Clinic. Foods that are rich in vitamin D include milk, yogurt, salmon, tuna, halibut and trout. However, too much vitamin D may cause other health problems.