In a young patient of your age group, this is unlikely to be anything serious. A postnasal drip or acid reflux can be the culprit that may be precipitated or predisposed by the anxiety.
The causes can be;
1) Mucosal injury (internal lining of pharynx and esophagus) may be caused by potassium chloride tablets, nonsteroidal anti-inflammatory drugs (NSAIDs), or antibiotics (doxycycline, tetracycline, clindamycin, trimethoprim-sulfamethoxazole).
2) Pharyngeal diverticulum
3) Peptic strictures due to reflux
4) Benign esophageal tumors
6) Esophageal Stricture or constriction
7) Globus; a psychological phenomenon of something causing difficulty in swallowing (there is a condition called Globus sensation, which may be responsible for the symptom of a problem in swallowing). Please read this resource;
Globus is quite a common phenomenon in your age group
Following investigations are necessary for the workup;
1) Fiberoptic endoscopic evaluation of swallowing and upper gastrointestinal endoscopy
2) Esophageal manometry (pressure study of the food pipe).
3) CT scan
4) Barium swallow.
I would not worry at all as anxiety may be the foremost cause here.
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