Nasal congestion on one side may be a symptom of unilateral nasal polyps, sinusitis, deviated nasal septum, nasal papilloma and other diseases, can not tell what the signs of the disease. 1. unilateral nasal polyps: unilateral nasal polyps block the nostrils, affecting ventilation, so nasal congestion. 2. Sinusitis: the presence of inflammation in the unilateral sinus causes swelling of the nasal mucosa, increased secretion of the glands, blocking the nostrils causing nasal congestion accompanied by headache, runny nose, decreased sense of smell and other symptoms. 3. Deviated nasal septum: the nasal septum is deviated to one side, resulting in unilateral narrowing of the nasal cavity causing nasal congestion. 4. Nasal papilloma: unilateral nasal growth of papilloma leads to nasal congestion, affecting nasal ventilation. If you have nasal congestion on one side of your nose, it is recommended that you consult a doctor in time to find out the cause of the problem and have it treated as soon as possible so as not to miss your condition.