Whether or not a fever will be isolated when going to the hospital needs to be analyzed on a case-by-case basis. If the fever symptoms are caused by infectious diseases, such as tuberculosis and hand, foot and mouth disease, isolation is required; if the fever is caused by common cold, inflammation or some other non-infectious diseases, isolation is usually not required. When fever symptoms appear, patients need to go to the hospital for relevant examinations to determine the cause, and then targeted treatment.1. Isolation required: If patients suffer from some infectious diseases, such as tuberculosis, hand, foot and mouth disease, etc., they usually need to be isolated. Since such diseases are contagious, if isolation is not carried out, contacts may be infected with the virus, and in serious cases, even cause group infection. In addition, since there is still a risk of contracting the new coronavirus, when a patient returns from an infected area, or has recently visited a medium or high risk area, isolation is required when fever symptoms appear to avoid carrying the new coronavirus on the body and causing the spread of the epidemic. 2. No isolation required: If a patient has fever symptoms caused by some non-infectious diseases, such as tumor, leukemia, hyperthyroidism, etc., isolation is usually not required. As such diseases cannot be spread by air and droplets, isolation is not required. Usually, patients need to be treated according to the specific cause of the disease under the guidance of a professional doctor. For example, tumors can be surgically removed, leukemia can be treated with targeted drugs such as nilotinib and dasatinib, and hyperthyroidism needs to be treated with drugs such as propylthiouracil and methiocarb. When fever symptoms appear, whether or not isolation is required, patients should take adequate rest, eat a light diet, and avoid overexertion and exercise so as not to interfere with recovery.