Right maxillary sinus effusion, usually refers to the presence of fluid in the maxillary sinus cavity can not be discharged, the fluid may be pus, mucus or blood, etc.; this condition is common in acute maxillary sinusitis, chronic maxillary sinusitis, trauma and other diseases. 1. Acute maxillary sinusitis: bacterial and viral infections occur in the right maxillary sinus, due to congestion, edema and increased inflammatory secretion of the mucosa in the sinus cavity, causing obstruction of the maxillary sinus sinus orifice, secretions remain in the sinus cavity and cannot be discharged, and then the formation of maxillary sinus effusion. 2. Chronic maxillary sinusitis: Chronic maxillary sinusitis is often formed when the treatment of acute maxillary sinusitis is not complete. If maxillary sinusitis recurs, the inflammatory secretion in the maxillary sinus cavity gradually increases, and in severe cases, pus can be formed. 3. Trauma: If the frontal face, or the nose and face are hit, it can lead to bleeding in the maxillary sinus cavity, stored in the maxillary sinus cavity, and this maxillary sinus effusion is usually a maxillary sinus effusion. The presence of the right side of the maxillary sinus effusion, you need to visit the hospital in time to check the specific cause and treatment, so as not to delay the condition.