The reason for the swelling and pain in the calf belly in the morning may be the following: 1. It may be that the muscles of the calf belly were accidentally cold when sleeping or the muscles of the calf belly were compressed for a long time, causing ischemic pain due to constriction of the local blood vessels and muscle ischemia. This is not a disease, get up and move or do massage to promote blood circulation symptoms will improve. 2, may be the back of the calf muscle chronic strain or aseptic inflammation, seen in long-term daytime walking, doing heavy physical labor and strenuous exercise of the lower extremities of the people, in the calf stomach can be felt very obvious pressure points, and may also appear skin flushing, swelling and other red, swollen, hot, pain. The skin may be red, swollen, hot and painful.