Calf belly like being hit by a stone may be related to muscle strain, soft tissue inflammation. 1. Muscle strain: insufficient warm-up before exercise, exercise is too strenuous, sudden, can lead to calf muscle pulling injury, which leads to localized swelling and pain, like being hit by a stone, after the activity can aggravate the pain. 2. Soft tissue inflammation: when the calf local muscle, fascia and other soft tissues due to infection or non-infectious factors of inflammation, can lead to calf belly like being hit by a stone like symptoms, such as pain, swelling, but also can be accompanied by redness of the skin, skin temperature and other manifestations. Calf belly like being hit by a stone can also be caused by other diseases, it is recommended to go to the hospital in a timely manner, clear the cause of the early treatment, so as not to cause adverse effects.