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Catarrh

Also called Post-nasal drip or Mucus build-up

Catarrh is a build-up of mucus in an airway or body cavity, usually the back of the nose, the throat or the sinuses. It is often caused by a cold or allergies and usually clears up within a few weeks. Some people have catarrh that lasts for months, which can be frustrating but is rarely serious.

Last updated Nov 9, 2026

What it is

Staying hydrated, using saline nasal rinses and avoiding triggers such as smoke can help.

Long-lasting catarrh may be linked to allergies, nasal polyps or chronic sinusitis, which can be treated.

Common signs

  • A constant need to clear your throat
  • A feeling of mucus running down the back of the throat
  • A blocked or runny nose
  • A cough
  • Reduced sense of smell or taste

How it is usually diagnosed

  • Questions and examination of the nose and throat
  • Allergy tests or a referral to an ENT specialist if it lasts

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Allergy test results
  • ENT letters and endoscopy reports, if any
  • Treatments tried and what helped

Questions to ask your doctor

  • Could allergies or sinus problems be causing it?
  • Are nasal sprays or rinses worth trying?
  • When should I see an ENT specialist?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Swelling around the eyes, severe headache, high fever or confusion with sinus symptoms

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources

Related conditions

Common coldA mild viral infection of the nose and throat. It usually gets better on its own within about a week.Allergic rhinitisInflammation inside the nose caused by an allergy, leading to sneezing, a blocked or runny nose and itchy eyes.SinusitisSwelling of the sinuses, usually after a cold, causing a blocked nose and facial pain. It usually gets better within 2 to 3 weeks.