Hello, is it normal for a teenager to lose a lot of weight as they grow and stretch? My 14 yo son seems to have become quite 'skinny' over the past couple of weeks. His eating habits haven't changed. Since Friday he has been complaining of a stiff neck (but has been gaming a lot). On Saturday he said he could feel a lump in his neck, I felt it too but I couldn't feel it yesterday. I am very worried. He said he doesn't want to see the doctor as 'he's fine'. Am I being paranoid?