What can be done to fix the clicking I have from trigger thumb?

Unfortunately, very little can be done, short of surgery, once a finger or the thumb has developed triggering. A cortisone injection into the tendon sheath may decrease the inflammation and shrink the nodule to relieve the triggering, but the results will probably be short lived. If your problem just started and the tendon isn't triggering, a splint may be used after the injection. The splint is used to rest the tendon and attempt to get the inflammation and nodule to shrink.