There are many reasons for fever without cough or runny nose, most commonly due to various infectious diseases, but also seen in malignant tumors, drug fever, rheumatoid arthritis, systemic lupus erythematosus and other diseases. 1. Fever caused by infectious diseases can be divided into systemic and limited: (1) Systemic is seen in cornual tuberculosis and disseminated tuberculosis, typhoid fever and paratyphoid fever, sepsis and infected endocardium, other infections such as brucellosis. (2) limited: see liver abscess, amoebic and bacterial, biliary tract infections, genitourinary tract infections, intra-abdominal abscesses such as subhepatic, subphrenic, paracolic, periappendiceal, retroperitoneal and pelvic abscesses. 2. Malignant tumors, drug fever, rheumatoid arthritis, systemic lupus erythematosus and other diseases can also cause fever. Fever is an important signal of the occurrence of the disease, should go to the hospital in time to consult the doctor, after clarifying the cause to give targeted treatment.