Things I end up explaining several times a day in the outpatient department, written down so you can read them slowly at home. This is general information, not advice about your own illness.
Most fevers are caused by infections the body clears on its own, and most people who come to the OPD with fever go home with rest, fluids and paracetamol. What matters is knowing the small number of signs that mean you should not wait.
Go to a hospital the same day if the person with fever has any of these:
Two groups need a lower threshold than everyone else. Any fever in a baby under three months old is a reason to be seen the same day, even if the baby looks well. And fever in pregnancy, in someone on cancer treatment, or in anyone whose immunity is known to be low should be assessed early rather than watched at home.
Otherwise, a fever that is settling by the fourth or fifth day is usually behaving normally. A fever that is still climbing after five days, or that settles and then returns, should be looked at.
Two things not to do while you wait. Do not start an antibiotic from a medical shop on your own: most fevers are viral, antibiotics do nothing for them, and taking them casually is a large part of why they stop working when they are genuinely needed. And do not stack painkillers — paracetamol is the safe choice for fever, and the medicines sold for pain and inflammation can make bleeding worse in dengue, which is common here in the months after the monsoon.
A doctor in a busy outpatient department may have a few minutes with you. How much of that goes on useful thinking rather than reconstructing your history depends almost entirely on what you walk in carrying.
Bring these four things:
Two more that help. If the patient is elderly or unwell enough to be confused, someone who knows the history should come along — not to speak over them, but to fill gaps. And try to be able to say when the problem started, even roughly. “Since about Dussehra” is genuinely more useful than “for a long time”.