Maxillary sinus cysts are asymptomatic in the early stages, but when they increase in size, they may cause symptoms such as restricted breathing through the nostrils on the affected side, stuffy feeling in the cheeks, rumbling, and nasal congestion. 1. The most typical symptoms of maxillary sinus cyst are restricted breathing through the nostril on the affected side, headache, pain in the maxillary sinus when pressed, and if the cyst increases and compresses the nasal septum, it will lead to deviation of the nasal septum. 2. If the cyst increases and fills the sinus cavity, there will be a feeling of stuffiness in the cheeks and pain on pressure, and toothache on the same side. 3. If the cyst leads to thinning and resorption of the bone in the anterior wall of the maxillary sinus, the cheeks will bulge, and a ping-pong ball or eggshell sensation can be felt when localized pressure is applied. 4. If the cyst blocks the opening of maxillary sinus, the symptoms of sinusitis may appear, such as nasal congestion, runny nose and so on. If the above symptoms occur, it is recommended to consult a doctor for timely treatment to minimize the adverse effects of the disease.