Pain in the back side of the ankle needs to be treated depending on the cause. The common causes are fasciitis, Achilles tendonitis, ankle sprain, ankle joint lesion, and the treatments include general treatment, physical therapy, medication, joint braking and surgery. 1. Fasciitis or Achilles tendonitis: pay attention to rest, suggest using hot towels and hot water to soak the feet to relieve the pain, and apply the creams that activate blood circulation and remove blood stasis, such as Yunnan Baiyao Cream, to assist in the treatment and alleviate the symptoms; if the pain is obvious, you can use Celecoxib or diclofenac sodium to reduce inflammation and analgesia; if accompanied by local muscle tension, you can use ethylpiperidinone hydrochloride to relieve the spasm. 2. Ankle sprain, strain: mainly due to local ligament strain, muscle strain. If it is acute injury of ankle joint leading to edema, intermittent ice packs within 72 hours, hot packs after 72 hours, physical therapy and so on. 3. Ankle joint lesions: such as ankle joint old fracture, osteochondrosis, necrosis of the talus and so on. It is recommended to go to the hospital for X-ray examination, after diagnosis, you can take joint braking treatment such as plaster or ankle brace to limit the ankle joint movement, with non-steroidal anti-inflammatory drugs anti-inflammatory and analgesic, such as ibuprofen, meloxicam, as well as surgical to help rehabilitation of the ankle joint. There may be other causes of posterior ankle pain. If the symptoms do not improve after rest, it is recommended to consult a doctor to find out the cause of the pain and treat it under the doctor’s guidance. Blind self-medication should be avoided.