Note that you probably shouldn’t read this post if you have health anxiety

generally yes but not always. Don’t freak the fuck out without other symptoms. Something as simple as taking pepto bismol can make your stool very dark and it’s obviously benign in that case. Similarly red in your poop can be caused by dietary stuff, classic trigger is beets

Ideally you’d see a doctor just to be safe, especially if it occurs for more than a few days or if you also have other symptoms like dizziness, fatigue, etc.

if you have symptoms like tachycardia or weak heartbeat, pallor, hyperventilation, sweating, excessive fatigue/not alert, etc it’s in the medical emergency zone and you need an emergency room asap.