That feeling is caused by the capsaicin molecules in the peppers activating the capsaicin receptors on our tongue - the more capsaicin, the hotter the pepper.

VOA: standard.2010.05.04

I think I know The truth is hiding in your eyes And its hanging on your tongue Just boiling in my blood But you think that I can't see What kind of man that you are If you're a man at all Well, I will figure this one out on my own I'm screaming I love you so My thoughts you can't decode How did we get here?

VOA: standard.other