Eosinophilic esophagitis – It is the inflammation of the esophagus, with accumulation of a huge number of eosinophil in the esophagus.

GERD – It is a condition in which the acidic stomach contents are forced into the esophagus causing damage of the esophageal mucosa.

Granuloma – It is a collection of immune cells. This happens because the immune system is unable to eliminate substances which, it perceives as foreign like viruses, fungi, keratin and bacteria.

Zenker’s diverticulum – It is a diverticulum of the mucosa of the pharynx above the upper sphincter of the esophagus or above the crico-pharyngeal muscle. It is also called as pharyngo-esophageal diverticulum or pharyngeal pouch or hypo-pharyngeal diverticulum.