Trouble descends from Latin turba (turmoil) through Vulgar Latin *turbulare and Old French trubler, carrying the image of stirring up muddy water into English.
Difficulty or problems; a situation in which one is liable to incur punishment or blame.
From Middle English trouble, borrowed from Old French trubler (verb) and truble (noun), from Vulgar Latin *turbulare, a frequentative form derived from Latin turbidus ('confused, disordered'), which came from turba ('turmoil, crowd, disturbance'). The Latin turba may trace to Greek tyrbē ('disorder, tumult'). The core image is of stirring up sediment in water — making something turbid — which extended metaphorically to creating disorder or distress in human affairs