Many diseases can cause low fever. Fever is a symptom, and diseases such as rheumatism, tuberculosis, chronic inflammation and low immunity can cause persistent low-grade fever; Long-term psychological stress and emotional instability can also cause disorders of the body temperature center, leading to unexplained persistent low fever. Problems in any system of the body may lead to persistent low fever. What is the cause of low fever? Routine tests such as blood, urine and stool are difficult to find. Some low-grade fever caused by bacterial infection can only be found by bacterial culture. Unknown low-grade fever, no drug abuse. Fever is one of the body's responses to disease. Taking antipyretics for patients with low fever is not conducive to the treatment of the disease. Abuse of antipyretics can also lead to leukopenia and aplastic anemia. Only when the body temperature is higher than 38℃ should we consider using antipyretics. Persistent low-grade fever should be treated as soon as possible, and comprehensive examination should be carried out as soon as possible. The early symptoms of some malignant tumors or bacterial infections are also low-grade fever. It is recommended that you go to the hospital for relevant examinations to avoid the deterioration of the cause of fever. High fever is one of the mechanisms to resist infection in the body. Our body can mobilize its own defense system to kill foreign germs by raising the body temperature (generally speaking, germs will die when the body temperature is above 39℃), thus shortening the onset time and enhancing the role of antibiotics. If the fever is reduced by drugs in the early stage of a cold (37-38.5℃), the bacteria in the body will temporarily be in suspended animation, and they will develop drug resistance. Once they reappear, they are usually more difficult to treat. ● Cold compress If the high fever is unbearable, you can use cold compress to help lower your body temperature. Apply a wet and cold towel to the forehead, wrist and calf, and cover other parts with clothes. When the cold compress reaches body temperature, it should be changed once and repeatedly until the fever goes down. You can also wrap the ice cubes in a cloth bag and put them on your forehead. ● Hot compress If the body temperature is not too high, you can use hot compress to reduce the fever. Wipe the patient's forehead and limbs repeatedly with hot and wet towels to dissipate heat until the fever is gone. But if the body temperature rises above 39℃, don't use hot compress to reduce the fever, but use cold compress to prevent the body temperature from rising further. ● Wiping the body to evaporate also has a cooling effect. Experts suggest using cold tap water to help the skin emit excessive heat. Although you can wipe the whole body, you should especially strengthen some parts with higher body temperature, such as armpits and groin. After squeezing out too much water, wipe one part at a time and cover the other parts with clothes. Body temperature will evaporate water and help dissipate heat. ● Bathing Sometimes, taking a warm bath is the most comfortable. It can also relieve fever symptoms. Baby should take a bath with warm water or wrap the baby with a wet towel, and change it every 15 minutes. ● When the liquid is replenished and has a high fever, the body will sweat and dissipate heat; But when you have a high fever, your body will close the sweat glands because of too much water loss to prevent further water loss, which will lead to the body's inability to dissipate heat. The solution is to replenish liquid, drink more boiled water and fruit and vegetable juice, which is rich in vitamins and minerals, especially beet juice and carrot juice. If you want to drink tomato juice, choose low-sodium products. Avoid solid food during fever until the condition improves. If vomiting is not serious, you can also eat ice cubes to reduce your fever. Pour the juice into an ice box and ice it into ice cubes. You can also put grapes or strawberries in the ice, which is especially popular with children with high fever. ● Take painkillers properly. If you feel uncomfortable, you can take painkillers. Adults take 2 aspirin or 2 paracetamol every 4 hours. The advantage of paracetamol is that fewer people are allergic to it. Because aspirin and paracetamol work in different ways, if you think that using either one can't effectively control high fever, you might as well use both. Take 2 aspirin and 2 paracetamol every 6 hours. When taking these drugs, you need to get the doctor's consent first. ● Pay attention to the right amount of clothes. If you feel very hot, take off too many clothes and let the heat in your body radiate. But if you shudder because of this, it means that there are too few clothes, and you should increase them until they are not cold. At the same time, don't let the room temperature be too high, and it is usually recommended not to exceed 20℃. At the same time, the room should be properly ventilated to help recovery, and keep soft light to relax.