Hello,
Thanks for posting your query.
Causes would be Peptic
esophagitis, esophageal web, candida esophagitis,
Pharyngitis,
Systemic sclerosis,
Achalasia cardia, Carcinoma.
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.
Regards,