Calf hamstring pain when walking intolerable pain clinically seen in the following cases: the most common is lumbar disc herniation, the herniated disc compression or irritation of the nerve root, resulting in the innervation area of the muscles of the radioactive pain, the pain is reduced when resting in bed, the pain is aggravated by the sitting position or standing up and walking, and sometimes the pain is radiating, pins and needles, or burning pain, the pain is more serious, this case should hang up the Spine Orthopedics. If the herniated lumbar disc is mild and the pain is not severe, you can also register for physical therapy with the Department of Acupuncture and Rehabilitation. If you have pain in the lower leg area in addition to pain in the knee when walking, combined with knee pain or knee popping, it is recommended that you consult an orthopedic joint surgeon.