A tendon pain on the outside of the leg from the top to the bottom of a tendon pain may be caused by improper exercise, may also be pear-shaped muscle syndrome, lumbar disc herniation and other diseases. 1. Improper exercise: If the recent lower limbs for a long time exercise, affecting the local blood circulation, the accumulation of excessive acidic metabolites, the muscle tissue caused by stimulation, to a certain extent, the outside of the leg from the top to the bottom of a tendon pain in the situation. 2. Piriformis syndrome: this disease is mainly caused by the sciatic nerve in the region of the piriformis muscle by the pressure, may be related to hip sprain, heavy walking, cold and other factors. The main symptom is sciatica, so the patient will have the manifestation of pain on the outside of the leg from the top to the bottom of a tendon. 3. Lumbar disc herniation: the main cause of this disease is disc degeneration, and studies have shown that it may also be related to disc injury, pregnancy, heredity, lumbar spine developmental abnormalities and other factors. Typical symptoms are lumbar pain, sciatica, etc., which can be manifested as a tendon pain on the outside of the leg from top to bottom. It is recommended that patients who suffer from upper to lower hamstring pain on the outside of the leg go to the hospital to clarify the exact cause and follow the doctor’s instructions.