You'll only start out with 16 hit points, but you can increase your maximum by acquiring Heart Tanks. Sub Tanks are also available to help keep you alive.
- For more details on Heart Tanks, see Mega Man X4/Items#Heart tanks.
Heart Tanks are permanent power-ups that increase your maximum health.
- For more details on Sub Tanks, see Mega Man X4/Sub Tanks.
Sub Tanks are permanent power-ups that allow you to fill up a reserve amount of health. You can use the contents of a Sub Tank at any time; however when used you must use it until either it is empty or your health is full.