Nasal congestion can be a symptom caused by viral colds, bacterial colds, or a condition triggered by rhinitis, sinusitis, nasal tumors, or foreign bodies in the nasal cavity. Nasal congestion may be caused by viral infections and often manifests itself as dizziness, sneezing, nasal congestion, and watery nasal discharge. If you have a stuffy nose with yellow runny nose, it may also be complicated by a bacterial infection, which can also trigger nasal congestion, dizziness, yellow runny nose or pus runny nose. In addition, nasal congestion symptoms can also be seen in allergic rhinitis, sinusitis, nasal tumors, nasal foreign body and other diseases triggered symptoms. It is recommended to go to the hospital for routine blood tests or nasal endoscopy if the discomfort is accompanied by nasal congestion, and follow the doctor’s instructions to treat the cause and symptoms.