Posterior calf muscle pain may be caused by physiological reasons such as over-exercise, or it may be caused by pathological reasons such as trauma, fasciitis and sciatica. 1. Physiological reasons: mostly seen in long-term non-exercise people, accidentally excessive exercise leads to the back of the calf muscle metabolites can not be discharged in a timely manner, thus causing the back of the calf muscle pain. 2. Trauma: due to trauma directly leading to acute injury to the calf muscle group, muscle tearing, bleeding and other conditions, thus causing pain, swelling, limitation of activities of the calf muscle. 3. Fasciitis: mostly seen in the long-term walking friction crowd, the rear side of the calf local soft tissue inflammatory reaction, thus causing the rear side of the calf muscle pain. 4. Sciatica: common in lumbar degenerative diseases, pyriformis syndrome and other diseases, the nerve innervating the posterior calf area is compressed, thus causing pain in the posterior calf muscles. There are other causes of muscle pain at the back of the calf, if rest does not relieve or accompanied by other symptoms, you should go to the hospital in a timely manner to improve the relevant examinations, clear reasons for targeted treatment as prescribed by the doctor, so as not to delay the condition.