Avoid your head blowing off

Lamb67

Senior Member
China/Mandarin
A conversation between a GP and an old man from a subtitle of BBC's GP Behind Closed Door.

Doctor: We would like it lower than that.
Old man: Definitely !
Doctor: To avoid your head blowing off or something.

The man is complaining of sweating and has suffered a high blood pressure.

I am wondering what's is blowing the head off please ?

Is it a joke like the heated steam within his body is blowing off his head ?

Thanks.
 
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