Fever caused by tonsillitis in children usually takes about 3~5 days to go down, and may take longer in severe cases. If the tonsillitis is caused by a common viral infection, the fever usually resolves in about 3-5 days. This is because viral infections are self-limiting, usually about a week can be cured, as long as the child does not have symptoms, usually do not need special treatment, symptomatic treatment can be. If the inflammation is caused by a bacterial infection, and pus is present, the fever may last longer, up to about 7 days. If the fever is due to mycoplasma infection, then the fever may last for more than 7 days. If a child has symptoms of tonsillitis, parents should take the child to the hospital for timely examination and treatment. Parents should urge their children to drink plenty of warm water to promote metabolism and help the inflammation to subside. Diet should be light, can eat more fresh vegetables and fruits, do not eat spicy and stimulating food.