Common causes of hypocalcemia include renal failure, hypoparathyroidism, malnutrition, etc. Hypocalcemia caused by diseases may need to be treated for a long period of time, and hypocalcemia caused by malnutrition may need to be treated for 1~2 months. 1. Disease-induced hypocalcemia: Hypocalcemia caused by diseases such as renal failure and hypoparathyroidism. Hypocalcemia caused by these diseases requires long-term treatment. During the period of illness, 10% calcium gluconate or 5% calcium chloride can be used as prescribed by the doctor; calcium carbonate, calcium citrate, vitamin D and other medicines can also be taken under the guidance of professional doctors to help control the development of the disease and actively treat the primary disease. 2. Malnutrition: Low blood calcium caused by malnutrition may improve in 1~2 months after adjusting diet. In normal times, we should pay attention to the appropriate supplementation of calcium-rich foods, and ensure adequate intake of calcium every day. Ensure sufficient intake of nutrients to avoid malnutrition. How long it takes for low blood calcium to get well mainly depends on the patient’s condition. It is recommended to go to the hospital as soon as possible, to clarify the cause of the disease and then cooperate with the doctor to receive treatment.