My 4yo (ex33wk, asthma, dysphagia, laryn/tracheomalacia) gets a painfully distended belly many days, worse w ill. could this be respiratory?what poss?

See doctor: It can be several dangerous issues. I recommend following up with the doctor immediately to evaluate in person.

Angioedema: Severe abdominal pain with distension suggests maldigestion generating gas (usually co2). Accompanying symptoms include flatus & diarrhea. Most common cause is lactose intolerance. Avoidance of all dairy for 1 week should give you the answer. A rare but overlooked cause is angioedema due to c1 esterase deficiency. 50% are inherited, the rest new mutation. There is a diagnostic blood test.