This refers to people who have had fever for more than two weeks and above 38℃, with fever as the main complaint and passed the medical history, physical examination and routine examination within one week of hospitalization, and the cause is unknown.

(1) infection

① Systemic: seen in miliary tuberculosis and disseminated tuberculosis, typhoid and paratyphoid, septicemia and infective endocardium, and other infections, such as brucellosis.

② Limitations: It can be found in liver abscess, amoeba, bacterial infection, biliary tract infection, urogenital infection, and abdominal abscess such as subcutaneous, diaphragmatic, paracolonic, periappendiceal, retroperitoneal and pelvic abscess.

(2) Malignant tumor

It exists in primary liver cancer, lymphoma, malignant histiocytosis, various leukemias and other solid cancers, such as lung cancer, kidney cancer and colon cancer.

(3) Connective tissue-vascular diseases

Include systemic juvenile rheumatoid arthritis, allergic sub-septicemia, systemic lupus erythematosus, polyarteritis nodosa, dermatomyositis, etc.

(4) Others

Such as granulomatous hepatitis, drug fever, false fever, hemothorax, hemoperitoneum and pulmonary infarction.

Second, the physical cooling has the following methods:

1, the most common method is to wipe with warm water. Usually, warm water is used to wipe the patient's forehead along the brow bone to the temple, then wipe the mandible, bilateral armpits and front trunk along the bilateral carotid arteries, and then wipe the chest, back, hands and feet three times a day, each time for 10- 15 minutes, which can play a physical cooling method.

2. But the above physical cooling method is suitable for patients whose body temperature does not exceed 39.5℃. If the body temperature continues to rise, it can be wiped with warm water, warm cold water or cold water.