Please choose the correct ending to complete the given sentence: Health: [header] How to treat a fever [title] Let the fever run its course. [step] A fever itself is not necessarily unhealthy. It's not an illness; it's a physiological response to something else.

Ending1: There are some things that always happen to a fever. [substeps] Stop to count the number of milligrams you take each time you're thirsty, eat time, have other conversations with friends and family, and drink more water. Ending2: Your body will often react to sickness or infection with a fever; it is a defensive response by your immune system as it tries to rid the body of pyrogens (fever-producing substances). [substeps] Acting too quickly to treat your fever can, counterintuitively, harm your body by undercutting one of its defensive measures. Ending3: Before you go over to your doctor, try to determine if your fever is something that could potentially be severe enough to be considered a cause of the fever. It's likely that your fever is a result of a virus that is changing your food and sleeping patterns. Ending4: In any case, provide medication to help keep it at a high level. [substeps] Treatment for fever typically consists of monitoring the fever and following the directions on the container of medication.

Answer format: ending1/ending2/ending3/ending4