Calcium tablets can cause constipation. The main role of calcium tablets is to supplement calcium, but many people will eat calcium tablets will appear to take improper phenomenon, then not only the effect of calcium is not good at the same time will also induce constipation. Many people eat calcium tablets at the same time will eat vegetables, such as spinach, cabbage, amaranth, etc., this kind of vegetables contain a lot of oxalic acid, oxalic acid will be combined with calcium to form calcium oxalate, calcium oxalate is not easy to be absorbed by the human body is more prone to constipation. Some people will eat too greasy food while taking calcium supplements, greasy food contains fatty acid substances, which will combine with calcium to affect the absorption of calcium, but also lead to the onset of constipation. When taking calcium supplements, try to choose between meals and avoid taking them with food, as this method of calcium supplementation will affect the absorption of calcium and cause constipation in the long run.