Achalasia is a rare disease of the esophagus characterized by esophageal dysfunction. The terminal portion of the esophagus that enters the stomach is constricted and narrowed, while the upper portion is dilated.

Patient Vu Phuc Nguyen was diagnosed with achalasia in 2018, the initial symptoms were choking on rice, then choking on water and gradually choking on everything. Although he had been treated for achalasia in many places, the disease did not improve, the condition of achalasia causing difficulty swallowing greatly affected his life.

Throat cancer is cancer that originates in the lower pharynx. The cause of throat cancer is currently unknown. Tumor usually originates from the pear sinus, when cancer spreads along the pharynx larynx, it will rise to the oropharynx and spread to the posterior wall of the pharynx, oropharynx, larynx.