There is no absolute recurrent fever can not be more than a few days, different diseases caused by fever time is not the same, generally recommended that the fever at home observation should not be more than 3 days, so as not to delay the condition.
There are many diseases that cause fever, such as upper respiratory tract infections caused by fever can return to normal within 3 days, if repeated fever or high fever does not go away, we need to be vigilant about the occurrence of complications or caused by other diseases; tuberculosis is manifested as a prolonged low-grade fever; leukemia, lymphoma, cancer and so on, may cause recurrent fever.
So there is no strict meaning of recurrent fever can not be more than a few days, but the longer the time, the more serious the disease. During the period of fever, you should pay attention to drink more water, have more rest, and eat a light and easy-to-digest diet.
If you have a high fever or recurrent fever, it is recommended that you go to the hospital in time to find out the cause of the disease and have regular treatment as soon as possible.