Can 1 cup of coffee in the morning cause diarrhea? a a couple yrs now, loose stools immediately after drinking coffee but fine the rest of the day.

Yes: A twenties female with loose stools in the morning after coffee might be experiencing an effect of the coffee or else another problem. A trial of coffee absence is in order and if the symptoms continue a visit to a doctor might be in order to rule out irritable bowel syndrome (ibs).

Lactose intolerance?: Coffee does not cause loose stool but it may be from cream or milk you add to the coffee.It can be due to lactose intolerance.Try a non diary creamer and if that stops the diarrhea that will confirm the suspicion of lactose intolerance. If not consult your doctor to find the cause.