(See also Overview of Esophageal and Swallowing Disorders.)
In cricopharyngeal incoordination, the cricopharyngeal muscle (the upper esophageal sphincter) is uncoordinated. It can cause a Zenker diverticulum. Repeated aspiration of material from the diverticulum can lead to chronic lung disease.
The condition can be treated by surgical section of the cricopharyngeal muscle.