Running out of hps is rarely a good idea.
Hit points, or just simply 'hp', is basically your life. Thus meaning when you run out of hp's, your character dies.
Your characters maximum hit points is decided by your current constitution . You inherently have 50 hit points at 1 con, and will gain an additional +8 for each point after that.
Maximum hp for a level 29 (regular) player with maximum constitution modifers peaks at 362.
A level 29 sporting maximum con modifiers, peaking at 362 hp.