I feel a pulse in my stomach, what dies it mean, and what do I do?

Aortic aneurysm. Around 65yo, we recommend one time screening ultrasound in men who('ve) smoke(d) to look for AAA (abdominal aortic aneurysm). Or we might order earlier if we feel especially large/wide bounding pulse in your belly. Best to go see your Family Doc for evaluation. .