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THERE ARE SEVERAL CAUSES of trigger points. These include direct trauma (an accident or injury), unusual exertion and repetitive strain. Direct trauma involves impact, as from a fall, or an automobile or skiing accident.
1 Tendon inflammation and swelling prevents the tendon from sliding easily in the tendon sheath, which causes triggering of the finger as it snaps to flex or extend.  Risk factors for trigger finger include diabetes, rheumatoid arthritis, and repetitive movements.