Symptoms of a vitamin D allergy include allergic skin reactions, such as irritation, inflammation, thinning and rashes, according to Mayo Clinic. Other side effects of vitamin D include daytime sleepiness, headaches and stomach problems, such as constipation, diarrhea, vomiting, stomach cramps and upset stomach.
Vitamin D may also cause issues in patients who suffer from kidney diseases, sarcoidosis, histoplasmosis, lymphoma and tuberculosis, states WebMD. This is because vitamin D raises the level of calcium in the body. This can cause kidney problems and complications. Vitamin D also worsens atherosclerosis in people who suffer from this condition.
Vitamin D may present side effects in people who suffer from diabetes and high blood pressure, according to Mayo Clinic. This is because it affects blood sugar levels and blood pressure. Therefore, these patients must be cautious when taking vitamin D.
Patients who suffer from immune disorders, lung diseases, liver diseases and musculoskeletal disorders must exercise caution when taking vitamin D, advises Mayo Clinic. Patients who suffer from frequent headaches, stomach disorders, thyroid disorders and skin disorders should also be cautious when taking vitamin D. Too much vitamin D can also cause symptoms such as weakness, metallic taste, nausea, vomiting and headaches, according to WebMD.