much like asthma causes inflammation in the lining of the airways sinusitis causes inflammation in the mucous membranes that line the sinuses. this inflammation causes the mucous membranes in the sinuses to secrete more mucus -- also similar to asthma. when the sinuses get inflamed the airways respond similarly in many people with asthma leading to sinusitis with asthma. prompt treatment of a sinus infection is often necessary to help relieve asthma symptoms.
can sinusitis “trigger” asthma?