Patients with alternating blockage of the nose often experience alternating nasal congestion for the following reasons: 1. Inflammation: The blockage is often related to inflammatory infectious and allergic diseases of the nose, patients may have acute and chronic rhinitis, acute and chronic sinusitis, allergic rhinitis, etc. 2. This symptom of rotating blockage will often be more obvious at night when sleeping, mainly related to the patient’s position change factor. If the symptoms of blockage persist for a long time, a careful and comprehensive examination of the nose, including nasal endoscopy and nasal imaging, is needed to determine the cause.