The symptoms of nasal congestion in the morning are often caused by a certain degree of congestion, swelling or edema of the nasal mucosa, which may lead to acute and chronic rhinitis, acute and chronic sinusitis, allergic rhinitis and other conditions, as follows: 1. Allergic rhinitis: Patients are exposed to dust, pollen and other allergenic substances, causing an attack of allergic rhinitis, more often seen in the spring and autumn when allergy symptoms are high. 3. Sinusitis: Some patients have more mucopurulent secretions accumulated in the nasal passages after waking up in the morning, often related to inflammatory factors in the sinuses, which can also cause nasal congestion symptoms become more obvious. If this symptom recurs, a nasal endoscopy is needed to help clarify the diagnosis.