Healing Hit Points | Game Master Companion 5e

Healing

A creature receives hit points from healing. A creature’s hit points can’t exceed its hit point maximum, so any hit points gained in excess of this number are lost. (97)

Hit points can be restored by:

a short rest or a long rest. (87)

certain magic items and spells. (97)

regeneration.

Temporary hit points. Temporary hit points are a buffer against damage. See examples of how to get them.

0 hit points and death. If a creature has 0 hits points, it's either dead or on the verge of death. Go here for details.

Death. A dead creature can’t regain hit points the usual way; special magic is necessary. Go here for details.

Other injuries. Some injuries are not hit point related. Go here for details.