Understanding Vitamin D Toxicity: Signs and Risks

5. Cognitive Symptoms

Some cognitive symptoms, such as apathy, fatigue, depression, and forgetfulness, occur gradually as calcium levels in the blood increase. However, an acute vitamin D overdose can cause rapid cognitive impairment.

Neurological symptoms include uncontrollable movements, slurred speech, difficulty swallowing, loss of balance, an unsteady gait, slow movement, tremors, and involuntary muscle tensing known as dystonia. Severe cases can lead to coma and death, so immediate medical attention is essential.