I have heartburn; can it worsen asthma?

Yes.: Reflux (especially at night) is a known asthma trigger.

Yes: Acetic acid (a weak acid) instilled directly into the esophagus can cause bronchospasm via something known as the broncho-esophageal reflex. Stomach acid coming into the esophagus can do the same thing.

Yes: Gastric esophageal reflux disease (gerd) can worsen asthma by either stimulation of the vagus nerve or micro aspiration. Your asthma may be better controlled if your gerd is aggressively treated. See your doctor for this treatment.