Hi good morning,
Rhinitis and sinusitis can have post nasal drip. It can lead to constant cough and sniffing sensation. At times you can have phlegm, which is actually the swallowed nasal secretions. However dry cough can be due to other causes also which causes throat irritation.
Proper evaluation and consultation can help us find out the cause of your problem and treatment.
Health Tips
start doing steam inhalation twice daily
maintain good hydration.