The most common cause of fever is infection, either viral or bacterial, which can cause fever. Colds caused by viral infections are common in autumn and winter, and they are often accompanied by coughing, coughing and runny nose, and are usually self-limiting. If the symptoms are severe, symptomatic treatment can be done. If the immunity decreases, bacterial infections can also occur, such as otitis media, sinusitis, etc., accompanied by tinnitus, severe headache, and repeatedly runny nose, which need to be treated with anti-inflammatory drugs.