Nasal congestion caused by colds will usually return to normal as the cold recovers. If the nasal congestion remains bad after a cold, it is considered to be less relevant to colds and may be caused by other diseases, such as allergic rhinitis, acute sinusitis, nasal polyps, etc. Specific treatments need to be determined by different diseases. 1. Allergic rhinitis: The onset of nasal symptoms is related to exposure to certain allergens, which may manifest as nasal congestion, nasal discharge like water, without fever and other symptoms. Firstly, you need to stay away from allergens, and secondly, you can use anti-allergic drugs such as cetirizine and loratadine to relieve the symptoms. 2. Acute sinusitis: acute purulent infection of the sinus mucosa, often secondary to acute rhinitis. Nasal symptoms may include nasal congestion, runny nose, olfactory impairment and rhinorrhea. Severe nasal congestion can be given ephedrine saline drops or hydroxymetazoline nasal spray; if there is a bacterial infection, it can be given a sufficient amount of penicillin such as amoxicillin to fight infection. 3. Nasal polyps: they can cause long-term nasal congestion and usually need to be removed under nasal endoscopy for complete treatment. Nasal congestion after a cold can also be caused by other diseases, such as symptoms do not improve or aggravate, it is recommended to consult a doctor in a timely manner, improve the examination, to clarify the cause of the disease, the specific choice of drugs and treatment should be in accordance with the doctor’s instructions.