Shoulder and neck fever refers to shoulder joint and neck fever, the possible causes are over-activity, infection, frozen shoulder and so on. 1. Excessive activity: After strenuous exercise, because the neck and shoulder joints have a lot of activity, the metabolism is accelerated, and the heat production is increased, which may cause localized fever, which is a normal phenomenon. 2. Infection: Infection caused by skin breakage or lung infection, etc. Inflammatory reaction caused by infection may result in fever in the shoulder, neck or even the body. 3. Frozen shoulder: because of long time hand raising activities, chronic strain, etc., causing adhesion of shoulder joint and surrounding tissues, causing aseptic inflammatory reaction, which can cause fever in shoulder joint and neck, mostly accompanied by shoulder pain, difficulty in movement, fatigue and other symptoms. Causes of shoulder joint and neck fever are more reasons, may also be related to tumors, biceps long head tendonitis and other diseases, if the symptoms continue to be unrelieved, it is recommended to consult a doctor in time, to clarify the cause of the disease, and to carry out targeted treatment.