In daily life, pregnant women have cramps in 6 months of pregnancy because after 6 months of pregnancy the body needs a lot of nutrients, which can easily lead to a lack of calcium in the human body, it will affect the normal absorption of nutrients in the local muscles, resulting in muscle cramps, weakness, acidity, softness and so on. The patient’s bones are also prone to osteoporosis and other conditions that can cause localized pain and cramps. In pregnant women after 6 months of pregnancy weight will also increase, will increase the load borne by the local muscles, easy to occur local muscle tissue strain, in the muscle will produce a large number of acid accumulation, can stimulate the local production of cramps performance.