The second way to avoid pain when playing paintball is to wear a mask and goggles. These allow you to protect your face and eyes from the paintball pellets, as well as keep other players from knowing where you are on the field.
If you are ever tagged in the head or arm, it is important to stay still and wait for help. Do not try to shake off the pain; this only makes it worse. Once you have been treated by a medic, continue playing defensively until they have arrived to finish the game.