trigger point

noun2

1. •
   An event, arrangement, provocation, etc. that leads a certain, generally violent or angered, action to be taken.

   • The unbalanced terms of the treaty was a trigger point for the war.
   • Me wanting to spend time with other people is a big trigger point for him.
2. •
   A hyperirritable spot in the skeletal muscle; a point in tender muscle that tends to elicit pain upon pressure or touch.