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Ear, nose and throat

Catarrh: symptoms, causes and how to ease it

Catarrh is a build-up of mucus in the nose and sinuses and phlegm in the throat. It is usually caused by a cold, flu, sinusitis or an allergy, and normally clears up by itself. Drinking water, steam and salt water nose rinses can ease it, and a pharmacist can advise on decongestants. See a GP if it lasts longer than a few weeks.

Last checked: 2026-10-11

Key facts

At a glance.

  • What it is

    The NHS says catarrh is a build-up of mucus in your nose and sinuses, and phlegm in your throat.

  • Does it go away?

    The NHS says it usually clears up by itself, with symptoms usually lasting only a few days, though sometimes longer.

  • Common symptoms

    A blocked or runny nose, a feeling of a lump in the throat, a need to swallow or cough, postnasal drip and a crackling feeling in the ears.

  • Is it harmful?

    The NHS says phlegm and mucus are not harmful and are the body’s way of clearing infection.

  • Home care

    Drink plenty of water, use a humidifier or steam, gargle with salt water or rinse your nose with salt water.

  • See a GP

    If symptoms last more than a few weeks, or you get new symptoms such as sore throat, swallowing problems or loss of smell.

What is catarrh?

Catarrh is the NHS term for too much mucus in the nose, sinuses and throat. The lining in your nose, sinuses and throat becomes swollen and creates more mucus than normal, which is your body’s natural reaction to things like infection.

People often describe it as a constantly blocked nose, mucus dripping down the back of the throat, or a need to keep clearing the throat. It is a description of symptoms rather than a single disease.

What are the symptoms of catarrh?

The NHS lists the following. These symptoms usually only last a few days, but sometimes they can last longer.

  • A constantly blocked or runny nose.

  • A feeling like there is a lump or something stuck in your throat.

  • A frequent need to swallow or cough to try to clear your throat.

  • A feeling that mucus is slowly dripping down the back of your throat (postnasal drip).

  • A crackling feeling in your ears.

What causes catarrh?

You may get catarrh if you have an infection such as a cold, flu or sinusitis. The NHS lists the following causes.

Causes of catarrh listed by the NHS
CauseNotes
InfectionsColds, flu and sinusitis.
Pollution and cigarette smokeIrritants that can make the lining produce more mucus.
Allergic reactionsTo things like pollen, dust and animals.
Conditions affecting the noseFor example nasal polyps, which are soft growths inside the nose.

How can I get rid of catarrh?

The NHS says catarrh can be annoying but usually goes away by itself. There are things you can do to ease the symptoms.

  • Drink plenty of water.

  • Sip ice-cold water when you need to clear your throat, rather than coughing or swallowing.

  • Use a humidifier, or sit in the bathroom with a hot shower running, to help loosen the mucus.

  • Gargle with salt water.

  • Rinse your nose with salt water.

How to rinse your nose with salt water

The NHS gives a homemade solution: boil a pint of water and leave it to cool, then mix in 1 teaspoon of salt and 1 teaspoon of bicarbonate of soda. Wash your hands, stand over a sink, cup the palm of one hand and pour a small amount of solution into it. Sniff it into one nostril at a time, breathing through your mouth and letting the water pour back into the sink, and try not to let it go down the back of your throat.

Repeat up to 3 times a day until your nose feels more comfortable. The NHS says unused solution keeps for the rest of the day in a clean, covered container, and a fresh solution should be made each day.

What can a pharmacist or GP do?

The NHS says a pharmacist can help with decongestants and other medicines to relieve catarrh, and with salt water nose rinses, available as specially designed bottles, nasal sprays and sachets.

A GP may suggest the same pharmacy treatments, and may want to rule out other conditions, such as nasal polyps, that could be causing the catarrh. The NHS describes nasal polyps as painless soft growths that can block the nose, treated with steroid drops or sprays and sometimes surgery.

How long does catarrh last?

The NHS says catarrh usually clears up by itself and the symptoms usually last only a few days, but sometimes longer. It advises seeing a GP if symptoms last for more than a few weeks.

If catarrh follows a cold, it is likely to settle as the infection clears. If it keeps returning, think about triggers such as smoke, allergies or pollution.

When to see a GP

See a GP if you have the symptoms of catarrh for more than a few weeks, or you get new symptoms such as a sore throat, problems swallowing or loss of sense of smell.

The NHS page on sinusitis says to see a GP if you do not get better after 3 weeks of treating symptoms yourself, if you keep getting sinusitis, or if a child aged 11 or younger has symptoms. Ask for an urgent GP appointment or call NHS 111 if you are very unwell, painkillers do not help, symptoms get worse, or you have a weakened immune system.

NHS and private pathways in general terms

Most catarrh is managed through self-care and a pharmacist. A GP is the next step if it persists. Persistent symptoms can lead to a referral to an ear, nose and throat specialist through the NHS or privately. Private ENT services may offer quicker appointments; the examination and tests available are broadly similar, so ask what is included.

Frequently asked

Questions people ask.

Quick, plain-English answers to the questions we hear most.

  • What is catarrh?

    Catarrh is a build-up of mucus in your nose and sinuses, and phlegm in your throat. The NHS says it usually clears up by itself.

  • What causes catarrh?

    The NHS lists infections such as colds, flu and sinusitis, pollution and cigarette smoke, allergic reactions to pollen, dust or animals, and conditions affecting the nose such as nasal polyps.

  • How long does catarrh last?

    The NHS says symptoms usually only last a few days, but sometimes they can last longer. See a GP if you have symptoms for more than a few weeks.

  • How do you get rid of catarrh in the throat?

    The NHS suggests drinking plenty of water, sipping ice-cold water instead of coughing, using a humidifier or steam from a hot shower, gargling with salt water and rinsing your nose with salt water.

  • Is catarrh contagious?

    Catarrh itself is not an infection. The NHS says it can happen when you have an infection such as a cold, flu or sinusitis, and those infections can spread to other people.

  • Is catarrh harmful?

    The NHS says phlegm and mucus are not harmful and are the body’s way of clearing infection, though catarrh can be annoying.

  • What is postnasal drip?

    It is the feeling that mucus is slowly dripping down the back of your throat. The NHS lists it as a symptom of catarrh.

  • How do I make a salt water nose rinse?

    The NHS says to mix 1 teaspoon of salt and 1 teaspoon of bicarbonate of soda into a pint of boiled water that has cooled, then sniff a small amount into each nostril, up to 3 times a day.

  • Can a pharmacist help with catarrh?

    Yes. The NHS says a pharmacist can advise on decongestants and other medicines, and on salt water nose rinses such as sprays, sachets and special bottles.

  • When should I see a doctor about catarrh?

    The NHS says to see a GP if symptoms last more than a few weeks, or you get new symptoms such as a sore throat, problems swallowing or loss of your sense of smell.

Where this comes from

Sources and checking.

This guide is for information, not medical advice.

Your GP or consultant knows your history and can tell you which parts apply to you. If your symptoms are severe, rapidly worsening, or come with red-flag features, seek urgent medical care. Figures and availability change, so treat them as a guide and confirm with the provider.

Published 2026-10-11, next review 2027-10-11.