Hemoptysis is an unlockable passive item in The Binding of Isaac, added in the Repentance DLC.

Double-tapping a fire button causes Isaac to sneeze blood that deals damage to enemies in front of him and knocks back pickups, enemies and projectiles.

The amount of damage the sneeze does is equal to 1.5x Isaac's damage.

Enemies knocked back take 8 + 2 × CurrentFloor damage if they hit a wall or an obstacle, and deal the same damage to other enemies they hit.

The sneeze has a cooldown period of 1 second.

The sneeze applies a Brimstone curse to enemies for 5 seconds which makes them take more damage from Brimstone-like laser beams and explode on death from such an attack, damaging and spreading the curse to nearby enemies.

The amount of damage cursed enemies receive from lasers is equal to 2 × DamageStat + 3. This damage also applies to lasers shot by enemies.

The range of the sneeze attack is affected by Isaac's shot speed.

This page shows information as of the latest Repentance release.
To see latest up-to date information about this item for the new Repentance+ (Online Co-op) DLC, check this page instead.

Defeat Delirium as Tainted Azazel.

Hemoptysis can be found in the following item pools:

The following tags are applied to this item:

• Check out the item description on the external Isaac Wiki.