There are usually three major types of nocturnal fever: 1. Infectious inflammation, which accounts for about 70%-80% of nocturnal fever, is usually due to bacteria, viruses, fungi and atypical pathogens such as mycoplasma and chlamydia, which infect the organism and cause bacterial inflammation, usually with inflammation of the gastrointestinal tract, inflammation of the respiratory system, and inflammation of the urinary system as the main clinical manifestations. 2. Nocturnal fever is also caused by The main cause is non-infectious inflammation, such as connective tissue disease, dermatomyositis, systemic lupus erythematosus, immune system diseases, etc. 3, common endocrine diseases will also have night fever, such as hyperthyroidism, hyperadrenocorticism, will have the clinical manifestation of night fever, some non-common diseases such as anemia, tumor patients will also have the above symptoms.