Lingering cold and flu symptoms can lead to a sinus infection. Chronic sinus infections can cause nasal polyps to grow repetitively. Surgery can be used to remove the polyps, but if you cannot avoid the factors leading to a sinus infection, the polyps will grow back after surgery. If you do have a sinus infection, avoid nuts, high salt and high sugar and spicy food, so your immune function can clear up the infection as soon as possible. Acupuncture can quickly reduce the nasal inflammation and prevent the polyps from growing.