There are many causes of nasal congestion, such as colds, sinusitis, nasal polyps and so on. 1. Colds are also known as narrowly defined upper respiratory tract infections, the main symptoms of coughing, nasal congestion, runny nose and other symptoms, there may be a change in position with different manifestations of nasal congestion, such as lying down nasal congestion aggravated by standing up to alleviate. 2. Sinusitis will cause swelling of nasal mucosa, congestion, inferior turbinate enlargement, thus appearing the phenomenon of nasal congestion, most of the early alternating, intermittent, serious cases may have persistent nasal congestion. 3. Nasal polyps are benign hyperplasia of the nasal mucosal tissue, usually from the mucous membrane of the nasal passage to the nasal cavity growth, manifested in the nose is not ventilated, serious cases may also have occlusive nasal sound, snoring and other symptoms. Nasal polyps are benign growths of mucous membrane tissue from the nasal passage to the nasal cavity, and in severe cases, they may also cause symptoms such as occlusive nasal sound and snoring.