vitamin D toxicity
a condition caused by excessive intake of vitamin D. Long-term overdose of vitamin D can cause irreversible damage to the kidneys and cardiovascular system and can retard growth in children. Excessive amounts of the vitamin may lead to high blood pressure and premature hardening of the arteries. Nausea, abdominal pain, loss of appetite, weight loss, seizures, and an irregular heartbeat may be signs of overdose.