Vitamin D helps your body to absorb calcium and maintain bone mineral density, according to the Office of Dietary Supplements. You can get this vitamin through exposure to the sun or from food sources such as fish, fish liver oils and egg yolks. An excess of vitamin D can cause vitamin D toxicity. Individuals with hyperparathyroidism, kidney disease, tuberculosis, histoplasmosis and sarcoidosis face higher risks of vitamin D toxicity, according to MayoClinic.com.
Nonspecific Symptoms
Early signs of vitamin D excess might include nonspecific symptoms such as nausea, vomiting, loss of appetite, constipation, weakness, fatigue and weight loss, according to MayoClinic.com.
Hypercalcemia
Excess vitamin D may lead to increased levels of calcium in the blood, a condition known as hypercalcemia. This condition can cause symptoms such as confusion, vertigo, tinnitus, unsteadiness and heart rhythm abnormalities, according to the Office of Dietary Supplements and MayoClinic.com. Hypercalcemia may also lead to calcium deposits in the body's organs. Seek medical treatment if you believe you have hypercalcemia.
Kidney Stones
Kidney stones may be a result of too much vitamin D in the body, according to the Office of Dietary Supplements. Hypercalcemia can also impair kidney function. Postmenopausal women taking calcium and vitamin D supplements face an increased risk of kidney stones.
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