It is like pooping: everyone does it, and everyone will sometimes experience diarrhoea and constipation. There may be days where you have to go twice because your stomach does not like you some time.

But if I have to go to shit like 3 times a day every day, fighting against your rumbling cramping stomach because every time it is just watery deadly sewer pipe corroding stuff coming out of you, you should see a doctor.

It is about frequency and amplitude of your symptoms. But there are also a lot of other syndroms and illnesses that may cause your issues. And never forget:

A man can have as many diseases as he damn well pleases.

Hickam's dictum

So keep in mind that having ADS does not mean there are no other conditions. There is actually a higher possibility to have something else as well (Comorbidity)