If loin to groin pain probably kidney stone.
If not you should look up "interstitial cystitis".
Rarely diagnosed but its quite common.
Especially if you have family history of allergies.

If you have allergy problems..and u ate a lot of gluten like bread, pasta and pastry. It could probably be interstitial cystitis.

Cut on gluten and dairy products. Take some vitamin C, magnesium oil and maybe NAC.


Maybe safer to rule out other serious condition by seeing a doctor first. But usually, no finding by doctors means most probably its functional problem, intersitial cystitis.

I experience this since i was small. Turns out its allergy and food
intolerance issue. I discover this in functional medicine training.