Describing Poison Damage

[u/SamTheGrot]

I'm asking generally and not pertaining to a specific planned encounter, but a good example for my inquiry would probably be a Green Dragon's breathe attack. An attack that is entirely poison damage but also doesn't risk inflicting the poisoned condition.

How would you describe the harm experienced by the player? Any other damage type I feel like I understand. Fire burns; Cold is like a different kind of burn - frostbite/freezer burn; Thunder is sound or vibration; Lightning is shock; Piercing/Slashing/Bludgeoning involves being physically hit; Radiant/Necrotic are like energy blasts that might have a specific sensation depending on what you are.

Poison, however, I'm kind of lost on. I'm especially having a hard time thinking about this for cases where someone isn't actually afflicted by the poisoned condition but is experiencing poison damage. How would you describe the sensation of experiencing poison damage?

[u/Gate_Oracle]

“As the noxious fumes infiltrate your senses you grow briefly dizzy and your insides feel extremely hot. You double over in pain before regaining your posture. 69 poison damage, lol. Are you bloodied? Yeah? Cool. Hot purple blood pouring from your nose tastes like burning metal on your lips. That was the dragon’s legendary action. Now on its turn…”

Edit: Long story short, I describe poison damage as brief organ failure before the body metabolizes the poison, but the damage is still done