Sinusitis toothache, mostly seen in maxillary sinusitis, is due to the maxillary sinus and teeth adjacent to each other, will affect each other, sinusitis can cause toothache, in addition to toothache can also trigger sinusitis. 1. Sinusitis cause toothache: such as acute sinusitis, due to the inflammation of the mucous membrane infection is intense, will stimulate the sinus nerve, causing pain in the cheek. The branches of the sinus nerve are distributed in the alveolar bone, so the stimulation of inflammation will cause radiating pain in the nerve, which can be manifested as toothache symptoms. 2. Odontogenic sinusitis: Sinusitis can be induced by dental infection. Because the front wall of the maxillary sinus and the upper alveolar process are directly adjacent to each other, the inflammation of the teeth will directly invade the sinus and induce sinusitis. If you suffer from periodontal disease, you can see redness and swelling of the alveolar process and the first premolar. It is recommended that the patient consult a doctor in time to check the cause and condition, and actively cooperate with the doctor to treat the disease.