Hello
Thanks for the query to health care magic.
SWALLOWING difficulty may be due to these possibilities , these are :
1
Esophagitis , burning in
esophagus due to some irritant nature food items like spicy , sweets burger , pizza etc.
Sometime these spicy food causes burning in the esophagus and this produces difficulty in swallowing .
Antacid ( if it contain oxetacaine is better) may provide much needed relief.
2
Tumor in food pipe . Diagnosis can be confirmed by MRI and by gastroscope .
3 Hyper acidity , sometime
acute gastritis develop such type of symptoms ,so be careful about that also.
However , as you mentioned that there is no difficulty during small bite , this is good thing .
But in my opinion it is better to consult an E N T specialist and get his opinion.
Hope this information will be useful for you.
Further any question I will reply happily.
Good luck.