Medical Items can heal you. They are commonly found in big hospitals (in Kin and Vernal) , clinics, military tents, or off a player you killed. You are recommended to have medical items with you.
List of Medical Items
-A bloodbag will never, ever spawn in a house. If you see one, someone probably dropped it there.
-Painkillers will reduce 20% of incoming damage for 45 seconds.
-MREs are useful for replenishing health AND food.
-If you are hurt in combat, use a blood bag to fight back and possibly win!