Slow Healing

Constitution 13 or lower.

You do not normally recover hit points or temporary ability damage through natural healing. If you undergo complete bed rest for a full day, you may recover either 1 hit point or 1 point of temporary ability damage. In addition, any conjuration (healing) spell cast upon you works at only half its caster level. For example, a cure moderate wounds cast upon you by an 8th-level cleric would only heal 2d8+4 points of damage, instead of 2d8+8 points of damage.

You do not heal quickly.