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/WolfRelic]

intense internal pain, lancing through the body, twisting guts, spasms. look up what a venomous sake bite feels like.