Can some one explain the connection between asthma and gerd?

Acid irritation: Acid entering the esophagus can a) irritate the lining of the esophagus and cause a neural (nerve related) reflex spasm of the muscles in the lung that spasm with asthma or b) if the refluxed acid comes up into the throat it can be aspirated into the lungs and cause direct irritation and spasm of the bronchial muscles.

Asthma / GERD: Asthma is reversible airway disease, there is narrowing of airway due to inflammation, mucous in airway, spasm, due to triggers followed by wheezing, respiratory distress. Anti-inflammatory + bronchodilator is treatment. Gerd is reflux of stomach contents in esophagus bc of lax sphincter, sometimes with vomiting, aspiration in lungs causing resp. Distress. Rx. Acid reducing med, sometime surgery.