There are usually the following types of chills and fever: 1. Infectious factors will have chills and fever, usually due to bacterial infections, viral infections, fungal infections, infections of atypical pathogens, will have chills and fever, accompanied by clinical symptoms of chills around the body, especially respiratory tract inflammation, digestive tract inflammation and urinary system inflammation caused by atypical pathogens and viral infections. 2. Non-infectious factors may also cause chills accompanied by fever, such as immune diseases, connective tissue diseases, usually rheumatoid arthritis, rheumatoid arthritis, dermatomyositis, etc. 3. Hypometabolic diseases, such as hypothyroidism, adrenocortical insufficiency. 4. Severe infections leading to shock, usually septic shock, hemorrhagic shock, obstructive Shock, distributive shock will appear the fever sensation of chills around the body.