Most of the most common causes of a painful tendon in the lower leg are sciatic nerve irritation symptoms. The sciatic nerve originates in the lower part of the lumbar and sacral spine, passes through the outer part of the pelvis, deep in the buttocks, through the thighs and calves to the ankles. Once the sciatic nerve passes through the path of any lesion injury, will lead to a hamstring pain symptoms in the leg, common lumbar disc herniation, transverse process syndrome, spinal stenosis, lumbar disc bulge and other lumbar diseases, as well as pear-shaped muscle syndrome, hip bursitis, soft tissue injury around the hip joint and other hip diseases will trigger this similar symptoms in the leg. Once the symptoms appear in other locations, a local examination of the location of the symptoms should be conducted in time to make a preliminary diagnosis of the disease.