Calf stomach pain after standing for a long time, consider the following aspects of the factors have a relationship, first of all, consider the muscle factors such as strain, etc., may also be vascular disease factors such as varicose veins, etc., but also due to other diseases such as lumbar intervertebral disc herniation and so on. 1. Muscle factors: standing for a long time can lead to calf muscle strain, which in turn causes calf stomach pain. The lactic acid formed by standing for a long time accumulates in the calf muscles, which can also lead to calf stomach pain. 2. Vascular factors: prolonged standing can lead to increased resistance to venous return in the lower limbs, venous blood in the lower limbs of the venous blood vessels in the accumulation of patients can appear symptoms of calf tummy ache, long-term can also lead to the formation of patients with varicose veins in the lower limbs. 3. Other factors: such as lumbar disc herniation, etc., can lead to aggravation of the condition when standing for a long time, especially for the sciatic nerve to complete the compression, can cause calf stomach pain. It is recommended that the patient go to the hospital, improve the auxiliary examination, combined with the patient’s symptoms in order to clarify the condition, and then the professional physician will give the appropriate treatment for the condition.