Thank you for the query.
It can be an inflammation caused by pill stuck in the esophagus
. But it can also be the first symptom of esophagus cancer (especially that this is not the first time). That is why it should not be neglected and gastroscopy is a very good idea and this is what should be done at first. If nothing wrong will be found, Omeprasole (or other proton pump
inhibitor) should be helpful as well as increased mineral water intake.
Other possible reason of such symptom is Zencers diverticulum what will be also seen in the gastroscopy.
Hope this will help.