The incident occurred when West was fighting for a rebound with Kyrie Irving. As West gained control of the ball, he began swinging his elbows wildly in the direction of Irving.
That prompted Thompson to get in the face of West, and the Cavs' JR Smithcame from behind and shoved West before Draymond Green pulled him away.
The faces of West and Thompson were cheek-to-cheek during the heated altercation.
After officials reviewed the incident, West, Smith and Thompson were assessed technical fouls.
Stephen Curry shot the technical free throw, putting the Warriors up 61-45 and capping a 22-2 run.
The Warriors wrapped up the title with a 129-120 win.
West, Thompson, Smith involved in heated altercation
David West gives Kyrie Irving a shove, then gets in the face of Tristan Thompson. JR Smith also gets a technical after he joins the fray late.