Frontal sinusitis is an inflammation of the mucous membrane of the frontal sinus, and patients usually have headache, nasal congestion, runny nose, loss of smell and other symptoms. 1. Headache: usually manifested as a periodic pain in the forehead, that is, getting up in the morning and feeling a headache, gradually aggravated, alleviated in the afternoon, disappeared in the evening, and repeated the next day. 2. Nasal congestion: patients will have persistent nasal congestion, mainly caused by swelling of the nasal mucosa and secretion accumulation. 3. Runny nose: usually caused by bacterial infection, the color of the nasal mucus is yellow and the texture is sticky. 4. Decreased sense of smell: frontal sinusitis patients with blocked nose can lead to decreased sense of smell, and in severe cases, loss of smell may also occur. If the above symptoms occur, the patient may be sinusitis attack, this time should go to the hospital in time to avoid delaying the condition, resulting in adverse consequences.