Swimming leg cramps may be caused by not warming up before swimming, calcium deficiency, obstruction of venous return, etc. Depending on the cause of the cramps, daily care or physiotherapy can be performed. 1. Failure to warm up: If you have not warmed up, it may cause cramps because the muscles are not relaxed. You need to take a rest in a safe place immediately and stretch your legs to relax your muscles and relieve the cramps. 2. Calcium deficiency: after disembarkation, you can take heat therapy or carry out physical therapy instrument for electrotherapy, you can also consider doing microwave treatment. As for the symptoms of calcium deficiency, it is necessary to supplement calcium in time, such as calcium carbonate, calcium lactate, etc., and vitamin D should be supplemented if necessary. 3. Obstruction of venous return: you can accelerate blood circulation and improve obstruction of venous return by hot compresses. Leg cramps after swimming, you need to move to a safe place immediately, avoid staying in the water all the time, otherwise it is easy to drown. If the cramps can not be relieved by the above ways, you should seek medical treatment in time.