Nasal polyps can be visible to the naked eye, but this is only in cases of more severe nasal polyp patients. In some severe cases, the polyps grow into and protrude from the nasal cavity, at which point a pale white, lychee-like polyp neoplasm can usually be seen in the nostril. For patients with nasal polyps, blockage of the nasal passages can cause symptoms such as nasal congestion, headaches, and runny nose. At this time, functional endoscopic sinus surgery can be used to remove the polyps from the patient's nasal cavity, thereby restoring normal ventilation function of the nasal passages, improving symptoms of sinus obstruction, and achieving a cure.