Source : Webster's Revised Unabridged Dictionary (1913)

Ailment \Ail"ment\, n.
   Indisposition; morbid affection of the body; -- not applied
   ordinarily to acute diseases. ``Little ailments.''
   --Landsdowne.

Source : WordNet®

ailment
     n : an often persistent bodily disorder or disease; a cause for
         complaining [syn: {complaint}, {ill}]