Anyone with common medical knowledge knows that a cold and fever caused by a viral infection can heal itself even without treatment and is self-limiting, so can a fever caused by a bacterial infection heal itself? The answer is yes, but only if you have a certain level of immunity. Immunity is the body’s own defense mechanism, the body’s ability to identify and destroy any foreign invasion (bacteria, viruses, etc.), the ability to deal with mutant cells and viruses, bacteria infected cells, is the body’s physiological response to identify and expel “foreigners”. Many pathogenic bacteria are already present in the human body, but they do not cure the disease; only when the immune system is low will they exert their pathogenic power, causing fever, headache and other symptoms. Fever itself is the body’s defense response to infection. For fever caused by mild bacterial infection, some people have a strong immune system and can heal themselves. However, fever due to bacterial infection usually has other symptoms that are much more severe than viral infections, such as chills, sepsis, septicemia, etc. Most cases require antibacterial treatment to relieve the symptoms so as not to delay treatment and cause serious infections. For fever caused by bacterial infection, if the infection is mild, some patients with better immunity can recover on their own without treatment, but most cases should be treated with symptomatic application of antibiotics to help the body resist bacterial invasion and promote recovery from the disease according to the extent of the infection and the patient’s own symptoms. It is recommended to seek medical attention in a timely manner, according to the situation, scientific diagnosis and treatment.