- Persistent nasal symptoms are often harmless, but rarely all have the same cause.
- Allergic and non-allergic rhinitis are common and sometimes resemble each other.
- Nasal polyps, chronic inflammation and rebound from decongestant sprays can cause persistent blockage.
- One-sided blockage, repeated bleeding, a visible mass or clear pain need extra attention.
- People with nasal polyps relatively often also have asthma or other inflammatory airway problems.
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