Feeling snot but not able to blow out may be caused by dry rhinitis, vasomotor rhinitis, nasal polyps and so on. 1. Dry rhinitis: The dryness of the nasal cavity can make the secretions in the nasal cavity become dry and difficult to be discharged, resulting in snot that cannot be blown out. 2. Vasomotor rhinitis: The congestion and swelling of the nasal mucosa or the enlargement of the inferior turbinate of the nose can lead to symptoms such as difficulty in blowing out the nose, nasal congestion, itching and sneezing. 3. Nasal polyps: Nasal polyps are benign swellings in the nasal cavity. Nasal polyps can be obstructed by the polyps, resulting in nasal discharge that is difficult to blow out, and is usually accompanied by nasal congestion, pain, and decreased sense of smell, among other clinical symptoms. There may also be other reasons, it is recommended that the patient go to the hospital for a clear diagnosis.