The possible causes of leg cramps during pregnancy are: 1. Severe calcium deficiency can cause muscle contraction, which leads to cramps, and note that lack of vitamin D can also affect calcium absorption. After pregnancy, fetal bone development will consume the mother’s calcium, so calcium deficiency causes leg cramps in pregnant women is the most common, you can eat more fresh vegetables and calcium-rich meat, more sunshine to promote calcium absorption; 2, pregnant women’s exercise is small so that blood circulation is reduced may also cramps, so we must adhere to moderate exercise, good rest after exercise, you can put a pillow under the feet to relax; 3, fatigue caused by cramps, such as If you have been standing for too long during the day or exercising too much, pregnant mothers can bubble their feet before going to bed and gently massage their leg muscles and foot acupuncture points.