Sore calf stomach is considered to be caused by the following reasons: exercise, strain, lumbar spine disease. 1. Exercise: a large number of lower limb exercises in a short period of time lead to a large accumulation of lactic acid in the calf muscles, resulting in the symptom of sore calf stomach. 2. Strain: standing or walking for a long time, engaging in heavy labor for a long time, etc., resulting in local aseptic inflammation of the calf muscles of the lower limbs, manifested in the symptoms of calf tummy acid. 3. Lumbar spine disease: lumbar disc herniation, lumbar spinal stenosis and other diseases compression of the nerves appeared in the calf tummy sore symptoms. Causes of calf stomach acid also include cold, lower extremity venous thrombosis, etc., it is recommended to go to the hospital in time, clear the cause of the perfect examination, give targeted treatment.