The tendon pain on the back side of the foot neck position refers to the pain in the Achilles tendon position, which is usually due to two reasons: First, due to the strain of the Achilles tendon, such as when performing strenuous exercise or falling from a height, the sudden force of the Achilles tendon exceeds the normal load of the Achilles tendon, which will lead to the strain of the Achilles tendon, the rupture of the local blood vessels, blood seepage leads to the swelling of the tissue, and also due to the formation of inflammatory edema due to local injury, which will have an effect on the The local blood vessels rupture and bleed, leading to swelling of the tissue, and also the formation of inflammatory edema due to the local injury, stimulating the peripheral nerves and causing obvious pain in the heel, which is the Achilles tendon at the back of the ankle joint, and further strain on the Achilles tendon when continuing to move, leading to further aggravation of the pain. Second, the Achilles tendon position strain and cold, such as athletes often activities, as well as the Achilles tendon by pulling or active contraction, a long time will form excessive fatigue, resulting in strain injury. If the Achilles tendon is cooled after the activity, it will lead to a decrease in circulation and a gradual increase in inflammation and accumulation of inflammation, which will also lead to a significant pain in the heel and Achilles tendon.