The flexors of your wrist and fingers work together to bend your wrist and curl your fingers. They are not differentiated in the same way that the finger and wrist extensors are. Pain may occur in just one or two fingers, with or without pain at the wrist.
The hallmark of finger flexor pain is that it feels as if it extends past the fingertips. You may not even be able to tell which side of your finger hurts, but if it hurt through the length of the finger to the tip and beyond, you have a trigger point in a finger flexor. Similarly with the thumb flexor – the pain projects to the tip and beyond.
Unlike the extensors, finger and wrist flexors are activated more by sustained contraction and shortening than repetition. Activities that can activate wrist and finger flexor trigger points include: gripping the steering wheel tightly during a long ride, paddling or rowing a canoe, kayak, scull, etc. with a tight grasp