J00-J06: Acute upper respiratory infections

J01: Acute sinusitis

Acute sinusitis is a group of conditions affecting the sinuses, which are air-filled spaces behind your forehead, cheekbones, and bridge of your nose. These conditions are typically characterized by inflammation and swelling of the sinus lining that leads to an accumulation of fluid and increased mucus production. This can cause symptoms such as a stuffy nose, facial pain or pressure, reduced sense of smell, and a cough that worsens at night. In many cases, these symptoms develop rapidly and last a short time, typically less than four weeks. Acute sinusitis is commonly triggered by a cold or other respiratory infection, but it can also result from allergies or certain health problems. The condition might affect the entire sinus area or be limited to one or more specific sinuses.