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There can be several underlying possible causes.
These can include allergic reaction like hay fever or allergies to foods or dust mites, gatro esophageal reflux, side effect of certain medicines for control of blood pressure etc...
Certain structural problems may also be responsible including nasal polyps or deviated nasal septum.
At times no particular reason can be ascribed and at that time vasomotor rhinitis is considered to be causative.
Allergic reactions are among the more common reasons.
Mast cell stabilizers like Montekulast are effective in allergic conditions.
But you need to get yourself examined y a doctor to diagnose the underlying cause and treat accordingly.