Calf stomach distension may be caused by physiological factors, may also be lower extremity varicose veins, lumbar intervertebral disc herniation and other disease factors. 1. Physiological factors: standing for a long time leads to poor blood circulation in the lower limbs, which can cause symptoms such as distention of the calf stomach and lack of energy; long-term non-exercise people suddenly exercise or strenuous exercise will lead to an increase in lactic acid secretion, which can cause distention of the calf and lack of energy, and can be accompanied by a feeling of localized acidity and distension. 2. Disease factors: varicose veins of the lower limbs are caused by various reasons such as blood stagnation and weak walls of the veins, which lead to vein dilatation and tortuosity, and impaired blood circulation leading to distension of the calves and lack of energy, which may be accompanied by other symptoms such as pain. In the case of lumbar disc herniation, the herniated lumbar disc compresses the nerve root, resulting in sensory-motor abnormalities in the local and distal innervated areas, leading to calf distension and lack of energy. It is recommended to go to the hospital to consult a doctor to determine the cause of calf swelling and lack of energy after eliminating physiological factors.