Frontal sinusitis is an inflammatory disease that occurs in the mucous membrane of the frontal sinus, and the early symptoms include nasal congestion, runny nose, headache, and impaired sense of smell. 1. Nasal congestion: it is caused by the swelling of nasal mucosa or the accumulation of secretions in the nasal cavity, mostly manifested as persistent nasal congestion on the affected side. 2. Runny nose: nasal discharge is mostly purulent or mucopurulent, with more nasal secretion in the early morning or in the morning. 3. Headache: If the drainage of frontal sinus is blocked in the early stage, headache symptoms will appear, and the headache will gradually worsen after waking up in the morning, and gradually relieve in the afternoon. 4. Olfactory impairment: mostly caused by swelling of the nasal mucosa, usually temporary. Frontal sinusitis patients with these symptoms, you need to go to the hospital in a timely manner for relevant examinations, and actively cooperate with the doctor to take treatment, control the infection, improve the sinus drainage and ventilation disorders.