Why I had to switch to iPhoneSE Over past few months, I have been experiencing increasing pain in my left wrist and thumb. Sometimes I would wake up in the middle of the night in extreme pain. I thought it was a broken bone or something like that. I mean it was painful and it forced me to visit my doctor. According to my doctor, it was because of overusing my left thumb on the phone. She pointed out it is only a matter of time before this turns into a full-blown case of carpal tunnel syndrome and I will need surgery to fix it. So I have a brace on my left hand and a smaller phone will allow me to do a lot less than the big phone and hopefully I will heal sooner.