Health is measured by a bar next to the energy bar in the bottom right corner of the user interface (UI). The health bar is only visible while inside of The Mines, the Secret Woods, the Slime Hutch, or when the meter is not full. Outside of the Mines, the most common ways to lose Health are by getting hit by the train on the Railroad, or by the Slimes in the Secret Woods or in the Slime Hutch.
Health can be replenished either by consuming food, sleeping, using the Spa, or eating Stardrops. In a multiplayer game, Health (and Energy) can be replenished by standing in bed without going to sleep for the day.
Maximum health capacity is increased by 5 for each level gained in Combat skill, and can be increased further by choosing the Fighter and Defender professions in the Combat skill tree.
Finding Secret Note #10 and then meeting Mr. Qi at level 100 of the Skull Cavern will award the player with a cutscene in which Mr. Qi gives the player "Iridium snake milk", which permanently increases Health by 25 points.
The player will pass out when health reaches zero. Clint, Linus, Maru, Robin, or Harvey, whoever has the highest friendship, will awaken the player. Depending on which one it is, the player may wake up in the entry room of the mine, in the bedroom of the farmhouse, or in Harvey's Clinic. If the player passes out inside the Skull Cavern, he/she will be awakened inside Harvey's Clinic.
While passed out, the player will lose money, items, and current progress in The Mines or Skull Cavern. Items that have been lost are non-retrievable, so it is a good idea to keep valuables in a chest when exploring. The amount of money lost is determined by the player's currently available gold. Up to 5,000g can be lost.
- When eating healing items, the player gains approximately 12.5% more health than what is displayed in the tooltip.