What Causes Nasal Congestion? Common & Serious Causes Explained
Nasal congestion can be caused by Sinusitis, Allergic Rhinitis (Hay Fever), Influenza (Flu) and other conditions. Learn which causes are serious, which are benign, and when to seek urgent medical evaluation.
Updated March 27, 2026
Nasal congestion has multiple causes, ranging from benign to serious. The most common include Sinusitis, Allergic Rhinitis (Hay Fever), Influenza (Flu). Sinusitis is inflammation of the sinuses, often following a cold or allergy. It causes facial pain, nasal congestion, thick nasal discharge, and reduced sense of smell. Acute sinusitis lasts up to 4 weeks; chronic sinusitis persists over 12 weeks.
Clinical Context
The causes of nasal congestion range from benign to serious. Identifying the underlying cause requires clinical evaluation. Common causes include Sinusitis, Allergic Rhinitis (Hay Fever), Influenza (Flu), Chronic Sinusitis, and others.
Clinical Pathway
Nasal congestion — Symptom HubSymptomSinusitis — Full Condition GuidePrimary CauseSinusitis — Differential DiagnosisDifferentialAllergic Rhinitis (Hay Fever) vs. Sinusitis — Comparisonvs.Allergic Rhinitis (Hay Fever) — Full Condition GuideCauseInfluenza (Flu) — Full Condition GuideCauseChronic Sinusitis — Full Condition GuideCauseFrequently Asked Questions
Why do I have nasal congestion? common & serious causes explained?+
Nasal congestion has multiple causes, ranging from benign to serious. The most common include Sinusitis, Allergic Rhinitis (Hay Fever), Influenza (Flu). Sinusitis is inflammation of the sinuses, often following a cold or allergy. It causes facial pain, nasal congestion, thick nasal discharge, and reduced sense of smell. Acute sinusitis lasts up to 4 weeks; chronic sinusitis persists over 12 weeks.
What is the most common cause of nasal congestion?+
Common causes include Sinusitis, Allergic Rhinitis (Hay Fever), Influenza (Flu). The most likely cause depends on age, associated symptoms, and medical history.
When is nasal congestion dangerous?+
Seek medical attention if nasal congestion is persistent, worsening, sudden in onset, or accompanied by other concerning symptoms.
Can nasal congestion be caused by stress or anxiety?+
Yes — psychological stress can contribute to many physical symptoms, but organic causes should be excluded by a healthcare provider.
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