When the frontal sinus cyst is small, there is usually no special discomfort. As the size increases, the common symptoms include eye symptoms, facial symptoms, nasal symptoms and so on. 1. Eye discomfort: when the cyst presses on the orbit, it can cause the eyeballs to shift outward and downward, resulting in diplopia, eyeball protrusion, and a feeling of fullness in the eyes. 2. Facial symptoms: frontal sinus cysts can appear in the forehead orbital roof bulging, the surface skin is normal, can touch the sense of ping-pong balls or eggshells, if the bone resorption disappears, can touch the sense of fluctuation. 3. Nasal symptoms: spontaneous intermittent nasal overflow, which is caused by the cysts breaking down on their own and the cystic fluid flowing out through the sinus openings. When the volume of sinus cyst is large, it can make the top of the nose collapse, resulting in nasal congestion and decreased sense of smell. The nasal congestion can be relieved after the rupture of the cyst. It is recommended to consult a regular hospital for diagnosis and treatment of the above symptoms.