Hi, I M Suffering Chronic Nasal Congestion/mucus In Every Morning

hi, i m suffering chronic nasal congestion/mucus in every morning regardless of any seasons.
is it due to allergy or something else ?
i don't have cough but sometime at night i do have a bit cough which i think it might from post nasal drip.
when i wake up every morning, wash my face that is the time my tons of nasal mucus start appear...