If you sweat a lot when you have a fever, you can drink salt water in moderation. Fever if the body sweats a lot, a lot of sweating and sweat evaporation will take away a lot of water and electrolytes, so it may lead to dehydration and electrolyte disorders, so you can drink light saline water to replenish water and electrolytes (mainly sodium ions), but the concentration of saline water should not be too high, so it is called light saline water. However, if you only have a fever and do not sweat a lot, you can also drink only lukewarm water to promote the body’s metabolism and rehydrate the body by drinking a lot of water. You can drink salt water when you have a fever, and the salt water mentioned here refers to light saline, but it is recommended that you consult a doctor in time to clarify the cause of the disease and treat it in time to avoid delaying the condition.