Calf tummy pain and swelling may be overworked and other physiological reasons, may also be local inflammation, lumbar spine disease, lower limb vascular disease and other pathological reasons. 1. Overexertion: Due to excessive exercise or exertion, the calf muscles secrete too much lactic acid, which stimulates the peripheral nerves and gives rise to the symptoms of calf tummy pain and distension, which can be relieved with proper rest, which is a normal phenomenon. 2. Local inflammatory lesions: due to calf trauma can cause local bacterial infection, or due to long-term strain caused by local aseptic inflammation, such as fasciitis, etc., calf stomach pain can occur, accompanied by swelling. 3. Lumbar spine disease: commonly seen in lumbar disc herniation, lumbar spinal stenosis and other diseases, compression or stimulation of nerve roots, pain and numbness in the calf area, also accompanied by symptoms of lumbar pain. 4. Lower extremity vascular diseases: such as lower extremity venous thrombosis, varicose veins of the great saphenous vein and other diseases caused by lower extremity blood circulation disorders, the patient may appear in the calf stomach pain and soreness of the symptoms. There may be other causes of calf stomach pain and distension, it is recommended to consult a doctor in time to clarify the cause of the disease and carry out targeted treatment or therapy.