"She held her mobile phone for at least six hours and continuously used both thumbs to send messages to relatives and friends," Spanish physician Ines M Fernandez-Guerrero wrote in the journal.The next morning, that woman woke up with aching wrists."The diagnosis for the bilateral wrist pain was 'WhatsAppitis'," Fernandez-Guerrero added.He treated the woman with non-steroidal, anti-inflammatory drugs and asked her to completely avoid using the cell phone to send messages.