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First of all, i recommend you consult an E.N.T doctor to check for an organic cause for that feeling. If everything is normal and you do not suffer from swallowing difficulties
or pain during swallowing, most probably it is Globus sensation which is the feeling of a foreign body or a lump in the throat.
Globus sensation may be caused by Gastro-oesophageal reflux disease (it is when the acid present in your stomach refluxes back into the oesophagus). Make sure you leave a 2-3 hours duration between meals and lying down.