You go to Ms. Mocilan the biology teacher. She's a straight shooter and usually has the answers. You tell her that you think something is wrong with Bob. You notice that he is looking very different than when he first came to school. He kind of looks bug-eyed and his neck is kind of large. You let her know that you didn't want to say anything if it isn't anything, but you have a hunch that it is something. You ask her where you should start.
She asks if it looks like his eyes are bulging out. You tell her yes. It could be due to a variety of different things, she explains, but it sounds a lot like Graves Disease. It is usually accompanied with a high metabolism. That is an endocrine problem that has to do with the thyroid. The thyroid would be a great place to start.