Posterior bursitis of the Achilles tendon presents as a painful red lump over the back of the heel. Bursitis is a painful inflammation that occurs in the bursa. A normal bursa contains synovial fluid, which facilitates normal movement of joints and muscles and reduces friction. Bursitis can cause pain and limited movement of the limb. However, the specific symptoms depend on the location of the inflamed bursa. How can bursitis be prevented? 1, pay attention to rest: rest is the primary method to solve any joint pain, so the joint should be allowed to get good rest. 2, pay attention to hygiene: strengthen labor protection, develop the habit of washing hands with warm water after working. 3.Swing the painful arm: If the painful part is in the elbow or shoulder, it is recommended to swing the arm freely to relieve the pain. 4.Ice packs: If the joint is hot to the touch, you can use the ice pack method. Alternate with 10 minutes of ice and 10 minutes of rest. As long as the joint is still hot, do not use hot compresses. 5, alternating hot and cold: If the acute swelling and pain diminishes, and the heat has been eliminated, you can alternate hot and cold packs to treat, that is, 10 minutes of ice and 10 minutes of heat, and so on repeatedly.