The cause of a swollen arm joint may be mosquito bites, muscle strain, humeral epicondylitis, etc. According to the cause of the disease, physical therapy, drug therapy and surgical treatment should be chosen. 1. Mosquito bites: mosquito bites on the arm may be caused by mosquito venom stimulation of local swelling, pressure can be painful, attention should be paid to the cleaning and disinfection of the swollen parts, to avoid scratching the local, can be ice to relieve itching and pain, but also can be used externally with glycerine lotion to relieve itching. 2. Muscle strain: acute muscle strain of the arm, may also cause localized swelling of the arm joints and pain on pressure, acute injury 72 hours for ice, pay attention to arm braking and rest, 72 hours can be hot packs to promote blood circulation and inflammation absorption. 3. Epicondylitis of the humerus: aseptic inflammation due to repeated pulling of the elbow muscles, swelling and pressure pain of the elbow joint can occur, you can take ibuprofen and other medications to relieve pain, the use of transcutaneous electrical nerve stimulation and shockwave therapy to relieve inflammation stimulation, conservative treatment is ineffective, but also can be surgical treatment. Caused by a swollen arm joint and pressure pain in the cause of more, may also be related to fractures, osteophytes and other reasons, if the symptoms do not improve after rest, it is recommended to promptly go to the hospital to find out the cause of the disease, targeted treatment, the above medication, please follow the doctor’s instructions.