Throat is swollen but only hurts in the morning or at night from the drainage. what could be causing it to be so swollen?

Many issues: Many causes: post nasal drip, allergies, acid reflux from your stomach, viral or bacterial infection. Consult your private physician for an examination.

Allergy?: At this time, trees and grass pollen are in abundance. Oak trees, pecan trees, pine trees, and grass pollen allergy can trigger sinus discharge along with runny nose. If anyone is allergic to pollen, the immune system cells of the nose and upper airway produces mucus to dissolve the offending agents and thus results in post-nasal drip. Feeling of swelling of the throat could suggest inflammation.