How long can i wait with abdominal distension to see if it goes away without seeing a doctor?

Distended abdomen: Is your distension acute, &/or associated with fever, nausea, vomiting, bleeding? If so, please get medical attention now. If, on the other hand, associated with painful constipation then consider possible c-ibs. Medical evaluation under the rome 3 criteria can exclude obstruction, ileus, ischemic disease, tumors, dysmotilities of the gut, rectal dysfunction. Urgency of care depends on the cause.

Short time: Sometimes abdominal distension is transient and associated with flu or constipation or just something we ate. It should be short-lived and not associated with pain, nausea, or vomiting. If so, then see a doctor.