Calcium deficiency usually does not cause dizziness. Calcium deficiency can cause leg cramps, and in severe calcium deficiency, it can cause hand and foot twitching, and may also cause convulsive seizures. Calcium deficiency in middle-aged and elderly patients can cause osteoporosis and may also cause compression fractures, which should be corrected in a timely manner by taking oral calcium in calcium, calcium dihydrochloride, or intravenous infusion of calcium gluconate. At the same time should be more sunshine, can supplement vitamin D, promote calcium absorption. There are many causes of calcium deficiency, such as adolescents may be caused by excessive growth and increased calcium requirements, middle-aged and elderly people are mostly caused by excessive calcium loss, and may also be caused by certain drugs. The common drugs are hypotensive drugs, such as calcium antagonists, amlodipine, nifedipine extended-release tablets, nifedipine controlled-release tablets, which can cause calcium deficiency during long-term application.