Swelling and pain at the Achilles tendon can be caused by the following reasons: first, Achilles tendonitis, Achilles tendonitis is often due to long-term strenuous exercise or sports activities, resulting in chronic inflammation of the Achilles tendon, when there is swelling and pain at the Achilles tendon, accompanied by obvious local pressure pain and limited movement of the ankle, it is necessary to check the body early and examine the MRI of the Achilles tendon for diagnosis and early treatment. Second, calcification of the Achilles tendon, when the Achilles tendon has calcification, there can also be swelling and pain at the Achilles tendon, this time to early physical examination, early X-ray and CT of the Achilles tendon to diagnose and early treatment. Third, the sprain of Achilles tendon, when the Achilles tendon because of trauma or due to strenuous activities, external violence injury, and lead to acute sprain, can also have the swelling and pain at the Achilles tendon, can be accompanied by local bruising and ecchymosis, activity restrictions, this time to early examination, early X-ray of the Achilles bone, the Achilles tendon MRI to diagnose and treatment.