Doctors warn heavy usage of cell phones may lead to "cell phone elbow", an injury that can cause lasting damage. More info at DailyTech.
According to doctors, when you bend your elbow to hold your cell phone to your ear, you stretch a nerve which extends underneath the funny bone and controls the smallest fingers. According to Dr. Peter J. Evans, the director of the Hand and Upper Extremity Center at the Cleveland Clinic in Cleveland, Ohio, long chats can "(choke) the blood supply to the nerves. It makes the nerves short-circuit. The next thing you know, there's tingling in the ring and small finger."
Doctors are advising users who experience such tingling sensations to switch hands and, if possible, cut back on their use. The alternative is to risk long term damage to your nerves. The disorder officially goes by the name cubital tunnel syndrome, and its victims have troubled opening jars and performing other dexterous activities, such as playing musical instruments.