1,209 messages per month: The tendon that extends to the tip of the thumb showed significant thickening in research subjects who were frequent texters and who repeatedly flexed the interphalangeal joint, which is closest to the thumbnail, while texting, according to a medical study reported by The Wall Street Journal. The greater the number of texts, the thicker the tendon. Frequent texters (an average of 1,209 messages per month) reported greater thumb pain in the dominant texting hand than infrequent texters (50 per month).
(Source: The Wall Street Journal.)
