Bilateral frontal sinus and sieve sinusitis have systemic symptoms, nasal congestion, purulent nasal discharge, rhinorrhea and headache, and decreased sense of smell. 1. Systemic symptoms: common systemic symptoms in adults include loss of appetite, chills, limb pains, fever, depression, etc. In children, systemic symptoms are more serious. When children are sick, the systemic symptoms are more serious, such as high fever, convulsions, diarrhea, vomiting and so on. 2. Nasal congestion: Bilateral maxillary sinus and sieve sinusitis will lead to congestion and swelling of the nasal mucosa, secretions accumulate in the nasal cavity, resulting in persistent nasal congestion on the affected side. When the nasal congestion is severe, the patient may even breathe with his mouth open. 3. Purulent nasal discharge: there will be more purulent secretion or sticky secretion in the affected side of the nasal cavity, and there will be a small amount of blood in the nasal discharge. 4. Nasal pain and headache: Nasal pain is mostly caused by acute bilateral inflammation of maxillary sinus and sieve sinus directly stimulating the nasal cavity, while headache is mostly caused by swelling of nasal mucosa, secretion blockage and compression, at this time, in addition to the symptoms of headache, there will also be dizziness, memory loss and other symptoms. 5. Decreased sense of smell: The occurrence of olfactory failure is related to the blockage of the nasal cavity with purulent nasal discharge and the stimulation of the olfactory mucosa by inflammation. Symptoms of bilateral frontal sinus and sieve sinusitis appear.