sentences:  Ulnar tunnel syndrome is commonly seen in regular cyclists due to prolonged pressure of the Guyon's canal against bicycle handlebars.Another very common cause of sensory loss in the ring and pink finger is due to ulnar nerve entrapment at the cubital tunnel near the elbow, which is known as cubital tunnel syndrome.While being idiopathic in some cases, causative factors of the ulnar tunnel syndrome include tumors, ganglion cysts, repetitive use, anatomical variations, and diseases of the neighboring blood vessels (thrombosis or aneurysm of the ulnar artery).