Did the man have a bad headache?

M: Doctor! Doctor! Help me, please!
W: Take it easy, please, Sit here, now, what’ s the matter with you? And can I help you?
M:I feel sick. I have a bad stomache-ache, 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’ ll be fine.
M: Thanks, doctor. I’ll do as you told me. Good-bye, doctor.
W: Bye ! And take care.