Which of the following is listed as a symptom of vitamin D toxicity?

• A. Nausea/vomiting
• B. Headache
• C. Tremor
• D. Rash

Answer: (B)

When vitamin D toxicity occurs, it drives hypercalcemia — higher than normal calcium levels in the blood. That excess calcium can affect brain function and cerebral blood flow, leading to central nervous system symptoms such as headaches. Dehydration from the high calcium level can also contribute to headaches. While other signs of vitamin D toxicity, like nausea or vomiting, are documented, headache is a recognized neuro symptom linked to the hypercalcemic state. Rash and tremor are not typical hallmark features of vitamin D toxicity.