IBS is a diagnosis of last resort. You don't get that from a walk-in clinic, you get that from a months- or years-long quest to eliminate every possible cause, before your doctor throws up their hands and calls it IBS.

Counterpoint: someone I know personally got that diagnosis from a single doctor's visit, so this isn't exactly a hard rule.

Yeah, true. Different doctors have different standards, and there are significant regional differences in standards of care. I've had several walk-in clinics tell me that I need an established GP to deal with certain issues.

I thought walk in clinics were exactly urgent care.

Where are these quick, affordable, walk-in GI specialist clinics you speak of?