There is no fastest treatment for low-grade fever in adults, which can be relieved by dietary modification, life care physical cooling, and finding the cause of the disease and taking medication. 1. Regulate diet: If the body temperature is higher than usual, but lower than 38 ℃, it can be regarded as a low fever. Low fever makes the body in a more fragile state, this time we should pay attention not to eat cold stimulating food, to prevent the condition from worsening, at the same time, you can drink some hot porridge, or ginger jujube tea and so on to help the body sweat to cool down. 2. life care physical cooling: sweating can prompt the body to cool down, so if you want to quickly reduce fever to promote sweating. You can use warm water to soak your feet, warm water or alcohol bath to lower the temperature. Pay more attention to rest, drink more hot water, avoid staying up all night. 3. Find the cause of the medication: If it is a respiratory infection caused by adults with low fever, mostly accompanied by cough, nasal congestion and other symptoms, you can take antiviral drugs to relieve, such as oseltamivir capsules. If it is rheumatoid arthritis, ankylosing spondylitis and other causes of low fever, need to take indomethacin and other drugs under the guidance of the doctor in time for treatment. Unexplained low fever should not be used indiscriminately to prevent masking the development of the disease and delaying the diagnosis and treatment of the disease. It is recommended to consult a doctor in a timely manner to identify the cause of the disease under the guidance of a professional physician and carry out standardized treatment.