So is IBS. I am not sure its fair to expect precise diagnosis for a nebulous "disease".
Those hormones change things in your body, like redirect the blood in your body contracting or extending blood vessels.
>who doesn't feel some stress throughout the day?
It is a quantity thing, you can feel stressed during seconds, or during hours or during entire days.
For example, in a war when your family members could die at any moment, you feel stress for days. In you live in peace you just don't have an idea what that means.
I have not lived war myself but I had close contact with people in Ukraine and in the past conflicts like Congo or Central Africa Republic and other African wars.
Stress effects were obvious for people living in farms. Animals like hens can stop laying eggs or cows stop giving milk just by stress alone.
I'm not saying that stress doesn't have effects, but I think a diagnosis based on "stress" can often be reductive; who doesn't feel some stress throughout the day?