Hypochondriac or Attention seeking BF

So I have noticed my boyfriend is always complaining about something hurting or being sick. I noticed it at the beginning of our relationship and just let it go or I would actually look into his "pains and aches" and would be concerned. But now it's starting to annoy me so much! It's constant him being dramatic about little things or "I think I could have cancer! " to "I think I could be having a heart attack!" To "i have add" to making a huge deal when he hurts himself. I don't know why he does this. But I can't continue to pretend to be concerned. I'm afraid one day he really will be seriously sick or hurt but I'll brush it off cause he does cry wolf so often. He's a healthy 27 yr old man. He's strong , takes vitamins and eats pretty healthy and is active .. he's all around healthy. How should I handle this very petty issue ??