Did the man have a bad headache?

M: Doctor, I feel sick. I have a bad stomachache, and my head troubles me a lot.
W: Well, let me have a check. Open your mouth, please. And say "Ah".
M: Ah! Is that serious, doctor?
W: Not really. Did you have your supper this evening?
M: No, I only had some bananas.
W: And the bananas were not quite ripe, right?
M: Well, yes, they were a bit green.
W: That explains it.
M: I wish I had not eaten them.
W: Take this medicine twice a day and I’ m sure you’ 11 be fine.