You are able to Path of exile currency restore health:

Use potions - Hybrid Flask items and Life Flask allow you to restore a number of health points.

Steal Life - the Life Leech parameter allows you to restore health points based on the percentage of damage dealt, e.g. 1% of damage dealt with enemies, which is restored because of a character's health. Recover points based on hits and kills the Life on Hit parameter permits you to restore a number of health points for every enemy strike, while Life on Kill restores wellbeing for every murdered competitor. Return to the city - a visit to the city will restore health.

Lighting mechanisms, or more exactly the range of lighting (Light Radius), can also be connected with health points. The percentage of health points affects the amount of buy POE orbs light - the lower it is, the poorer the lighting will be. This mechanisms can be changed using the Arcane Vision passive skill.