Calcium is an important component of bones, calcium deficiency can easily lead to a decline in bone mass, which in turn leads to fractures and osteoporosis, etc. Many people will choose to take calcium tablets to supplement the lack of calcium to relieve physical discomfort. But it is not recommended to take calcium tablets for a long time, long-term, excessive intake of calcium may lead to discomfort. 1, gastrointestinal discomfort: calcium tablets will produce carbon dioxide when they encounter acid, leading to the risk of intestinal flatulence and anorexia symptoms; 2, nutritional deficiency: long-term intake of excessive calcium will also significantly inhibit the absorption of iron, selenium, barium and ions, which will easily lead to the lack of other nutrients; 3, stool Dry and knotted: long-term intake of calcium tablets, calcium and intestinal food residues easily combined with the formation of insoluble harder substances, which leads to dry stools, and even constipation; 4, stones: long-term intake may also affect kidney function, leading to kidney stones. If the elderly, pregnant women, children and other people who need calcium supplements, it is recommended to take calcium supplements under the guidance of a professional doctor, and at the same time to review the body after taking a period of time to see if the body is still calcium deficient, and then consider whether to continue to take calcium tablets. In addition, it is recommended to eat more calcium-rich foods in daily life, such as milk, eggs and lean meat, and to get more sunlight, which can also promote the absorption of calcium.