Underlying cause. Many times these are related to underlying environmental allergies, & so tx aimed at that can help a lot. An otc option that I usually tell my patients about are nasal saline sprays & sometimes nasal rinse products. Pls be careful to follow the directions carefully! Otc antihistamines are plentiful but can have interactions. I usually recomend that my pts avoid decongestants. Prob talk w/ ur doc.
Consider. Most people who think they have "sinus headaches" are actually having migraine headaches.