There are some fevers that can be self-cured, but for people who are weak and have persistent high fever, medication intervention is needed. For some fevers, such as mild fevers from vaccination, they are usually transient and the temperature can return to normal on its own in 1 to 2 days. For patients with fever who are physically fit and have no underlying disease, the fever can be self-healing if it is not severe, during which time they can drink more water to promote metabolism and prevent dehydration. For patients with low immunity, such as the elderly, children and patients with severe underlying diseases, when pathogens invade, due to low body resistance, may cause high fever, and it is difficult to return the body temperature to normal through self-regulation. It is necessary to consult a doctor in a timely manner to find out the cause of the disease, use non-steroidal anti-inflammatory drugs such as ibuprofen under the guidance of the doctor to reduce fever, supplemented by physical cooling methods such as warm water wiping, and if necessary, need to take antibiotics to fight infection.