There are many symptoms of calcium deficiency in adults, such as frequent cramps for no apparent reason, emotional agitation, and sleeplessness. Severe calcium deficiency can lead to osteoporosis and general bone pain. If the calcium deficiency is obvious, you can choose calcium tablets to supplement. In addition, the diet can eat more calcium-rich food such as milk, shrimp, lean meat, etc., appropriate outdoor activities in the sun is conducive to calcium absorption.