Can exercise decrease ulnar nerve pain and stiffness?

Potentially: An exercise program under the guidance of an occupational therapist coupled with massage therapy may decrease your symptoms. Discuss your options with your physician. Best of luck!

Neuralgia: Ulnar pain is usually do to entrapment of a nerve, exercise usually would not help. I would recommend you see a neurologist or neurosurgeon for further workup to see if this might be a surgical lesions or if it can be treated medically.