what causes low vitamin d
THEREFORE: If you have high blood calcium and low vitamin D, you must have a parathyroid tumor in the neck and you need an operation to remove the tumor. It is a tumor and it will not go away. Low Vitamin D levels do not cause the problem, they are a result of the problem.
For most adults, vitamin D deficiency is not a concern. However, some groups â particularly people who are obese, who have dark skin and who are older than age 65 â may have lower levels of vitamin D due to their diets, little sun exposure or other factors.