Thanks for posting your query.
Causes would be Peptic esophagitis
, esophageal web, candida esophagitis, Pharyngitis
, Systemic sclerosis
, Achalasia cardia
It needs detailed evaluation starting with preliminary investigations and proceeding further accordingly.
The investigations would start with X-ray, and with a contrast like barium, CT, MRI, Manometry.
Hope I have answered your query.
Wishing you good health.