Fevers are, in effect, status ailments in Mother 3 that can only be cured by walking a certain distance. While not having an in-battle effect, it prevents the party from dashing until it wears off, in which it then grants the afflicted member a new PSI ability. Fevers normally occur shortly after gaining a level, but only if the character is destined to gain a new PSI ability at that level. As such, non-PSI using characters like Duster or Boney cannot be afflicted by fevers. It also revives Unconscious members, leaving them with 1 HP.
- "For some reason, name started to feel feverish." when a character is afflicted by a fever.
- "Name's fever went away." when the fever wears off.