The calf muscle pain may be caused by the following reasons: 1, excessive fatigue of the calf, often seen in patients do long distance walking, or for the calf to do excessive exercise, then may cause fatigue injury of the calf muscle, or in the calf muscle inside a large number of lactic acid deposition, in the patient then down to the ground when walking with weight, will feel the obvious pain here. 2, calf The muscle strain is often seen in patients who do excessive activities involving the calf and ankle joints during intense activities, which may cause muscle strain and lead to pain. 3, vascular lesions of the lower extremities, such as embolism of the large arteries of the lower extremities, may lead to poor blood circulation in the lower extremities, and the patient may experience significant pain due to muscle ischemia in the calf area during walking. 4, peripheral nerve lesions, such as patients in the lumbar spinal stenosis, may be due to nerve compression in the spinal canal, which may lead to pain in the calf and intermittent claudication. In addition, when sciatica and lumbar disc herniation develop, radiating pain may also be produced in this area.