People check-in ER and leave before a physician can see them for many reasons.
Some people leave after the nurse’s triage, convinced that they are already feeling better or that their condition is not that serious. When a nurse tells you that your condition is not urgent, this still doesn’t mean you should leave the emergency room without seeing a physician. The purpose of the ER triage is to assign priority, so you should stay and wait for your treatment.
Leaving ER before you see a physician is not an only health risk. Leaving the emergency room unseen can also compromise your health insurance, so it is wise to wait for a physician to attend to you.