A therapist in an outpatient clinic walks to the waiting roo…

A therapist in an outpatient clinic walks to the waiting room to get their next patient. They notice that the patient is sitting quietly in a chair, but looks a little off, and when questioned, the patient states “I’m having some chest pain for the last 20 minutes.  I took my nitroglycerin about 5 minutes ago, and it’s starting to feel better.”  What is this patient exhibiting signs of?