While it won't cure your condition, nasal irrigation with saline may help relieve some sinus symptoms. Despite this, it's a remedy that is still not recommended. Why? One theory is that when we overdo it with nasal saline irrigation we increase our risk of developing sinus infections.
One study, for example, conducted by the American College of Allergy, Asthma, & Immunology found that when regular nasal irrigation users stopped rinsing, their rate of chronic sinus infections dropped by 62 percent the following year [source: Zerbe]. Nasal mucus is full of antibacterial, antiviral and antifungal properties important in protecting us against infection -- and when we use saline irrigation products regularly, we wash away those benefits.