It's deeper, but can also appear/disappear and have a cultural component. My closest mental image is people genuinely enjoying some soup, to immediately puke i

It's deeper, but can also appear/disappear and have a cultural component. My closest mental image is people genuinely enjoying some soup, to immediately puke it out as they hear it's made from crushed bugs, even as it's a lie. The reaction is visceral and uncontrollable, but the cause is not physical and is deeply rooted into their mind.