Calcium deficiency in adults can lead to convulsions. Calcium deficiency can cause a series of adverse symptoms in adults, the elderly or infants due to the low level of calcium ions in the blood. The excitability of the muscular nervous system is obviously increased, and the increased excitability of the muscular nerves will lead to muscle spasms and convulsions, which are still manifested in adults when they are deficient in calcium. Of course, calcium deficiency can be complicated by other more serious symptoms, such as cardiac arrhythmia, ventricular fibrillation and pathological fractures, osteoporosis and other diseases.