Ketosis generally refers to diabetic ketoacidosis, and ketosis and high fever are not necessarily related, therefore, if the high fever does not go away after ketosis is lowered, consider that there may be infections and other conditions. Ketosis generally refers to diabetic ketoacidosis, is an acute complication of diabetes mellitus, clinical manifestations include nausea, vomiting, breath smells like rotten apples, dehydration, etc., and in severe cases, shock and altered consciousness may occur. In the absence of co-infection, there is usually no sign of fever. If the fever remains high after ketosis is lowered, the possibility of infection, such as bacterial infection, can be considered, and blood tests and blood cultures can be used to help clarify the diagnosis. If the fever does not go down after ketosis is lowered, it is necessary to further define the cause of the disease and treat it in time to avoid delaying the condition.