cough specialist tests overview

Overview

Cough specialist tests are a series of investigations used to find the cause of a cough that lasts longer than 8 weeks (a chronic cough). These tests help doctors identify the underlying problem, such as asthma, acid reflux, or an infection, so they can recommend the right treatment.

Yes, chronic cough is very common. Many people undergo specialist tests to find the cause, and most cases can be successfully treated once the reason is found.

Chronic cough can affect people of all ages, but it is more common in adults. It can also affect children, especially those with asthma or allergies.

Symptoms

Common symptoms

• A cough that lasts more than 8 weeks.
• A dry or tickly cough with no mucus.
• A productive cough that brings up mucus (phlegm).
• Coughing fits that interrupt sleep or daily activities.

Symptoms in children

• Cough that wakes them at night.
• Cough with gagging or vomiting after a coughing fit.
• Cough that gets worse with exercise or cold air.

Symptoms in older adults

• A weaker cough reflex that may lead to fewer or quieter coughs.
• Higher risk of aspiration (coughing when eating or drinking).
• Cough that leads to exhaustion or falls.

Causes

Main causes

• Postnasal drip (mucus from the nose dripping down the throat).
• Asthma (especially cough-variant asthma).
• Gastroesophageal reflux disease (GERD) – stomach acid backing up into the throat.
• Infections like whooping cough or bronchitis that do not fully clear up.
• Medications such as ACE inhibitors (used for blood pressure).
• Smoking or exposure to smoke.
• More serious conditions like lung infections, pneumonia, or (rarely) lung cancer.

Risk factors

• Smoking or being around secondhand smoke.
• Having asthma, allergies, or GERD.
• Long-term exposure to air pollution or workplace dust and chemicals.
• A weakened immune system.
• Taking ACE inhibitors for high blood pressure.

When to see a doctor

See a doctor urgently if:

• Cough that produces blood.
• Severe shortness of breath.
• High fever with cough that does not improve.
• Chest pain when coughing.

Book a routine appointment if:

• Cough that lasts more than 3 weeks.
• Cough that interferes with sleep, work, or daily life.
• Cough that does not go away after a cold or chest infection.
• Cough that is accompanied by wheezing or a feeling of tightness in the chest.

Diagnosis

Your doctor will start by asking about your cough: when it started, what makes it better or worse, and if you have any other symptoms. They will also examine your chest and listen to your breathing. Based on this, they may recommend tests to look for underlying causes.

Tests that may be done

• Chest X-ray – a quick image of your lungs to check for infections or other problems.
• Spirometry – a simple breathing test where you blow into a tube to measure how well your lungs work.
• Blood tests – to check for signs of infection, inflammation, or allergies.
• Allergy skin tests – to see if you react to common allergens.
• CT scan – a more detailed scan of your lungs if the X-ray does not give enough information.
• Bronchoscopy – a thin, flexible tube with a camera is passed down your airway to look inside your lungs. This is done with sedation or anaesthetic.
• Laryngoscopy – a test to view your voice box and the back of your throat, often done if postnasal drip is suspected.
• 24-hour pH monitoring – a test for acid reflux where a small tube is placed in your oesophagus for a day.

What to expect at your appointment

Most tests are done as an outpatient, meaning you do not need to stay overnight. Some tests, like a chest X-ray or spirometry, take only a few minutes. Others, like bronchoscopy, may require a few hours at the hospital. Your doctor will explain each test beforehand and tell you how to prepare. It may take several appointments to find the exact cause of your cough.

Treatment

Treatment for a chronic cough focuses on the underlying cause. Once your doctor identifies why you are coughing, they will recommend a plan. This may include lifestyle changes, medications, or other therapies. The goal is to stop the cough and improve your quality of life.

Self-care at home

• Stay well-hydrated by drinking plenty of water.
• Use a humidifier or take steamy showers to soothe your airways.
• Sip honey in warm water or tea (for adults and children over 1 year).
• Avoid smoke, strong fumes, and other irritants.
• Rest when you are tired.
• Raise your pillow at night if cough is worse when lying down.

Medical treatments

Medical treatment depends on the cause. For example, if asthma is the culprit, you may be given inhalers to open your airways. If acid reflux is the problem, medicines to reduce stomach acid are often prescribed. For postnasal drip, nasal sprays or antihistamines may help. Antibiotics are only given if a bacterial infection is confirmed. Your doctor will choose the safest and most effective treatment for your specific situation. Always follow your doctor’s advice and do not stop any prescribed medication without speaking to them first.

When is surgery considered?

Surgery is rarely needed for a chronic cough. It may be considered for very specific causes, such as a structural problem in the airway or a tumour. In most cases, medications and lifestyle changes are enough.

Living with this condition

Living with a chronic cough can be tiring and frustrating. It helps to keep a cough diary: note when you cough, what you were doing, and what seems to trigger it. Share this diary with your doctor. Avoid triggers like smoke, strong smells, and cold air. Stay on top of any treatments your doctor recommends.

Lifestyle tips

• Quit smoking if you smoke, and avoid secondhand smoke.
• Use air filters at home if you have allergies.
• Avoid foods that trigger acid reflux, such as spicy or fatty meals.
• Practice good hand hygiene to avoid infections.

Diet and exercise

Eat a balanced diet rich in fruits, vegetables, and whole grains to support your immune system. If you have GERD, eat smaller meals and avoid eating within 3 hours of bedtime. Gentle exercise, like walking or yoga, can help your overall health, but stop if it worsens your cough. Talk to your doctor before starting a new exercise routine.

Mental health and emotional wellbeing

A long-lasting cough can make you feel anxious, embarrassed, or depressed. It might disrupt your sleep and social life. It is important to talk to your doctor about these feelings. They can offer support or refer you to a counsellor. You are not alone – many people find that treating the cough improves their mood.

Prevention

Many causes of chronic cough can be prevented or reduced. Avoiding smoking, managing allergies, and treating acid reflux early can help. Practice good hygiene to avoid infections. If you take ACE inhibitors and develop a cough, talk to your doctor – they may switch you to a different medication.

Vaccines

Vaccines can help prevent some infections that lead to chronic cough. Make sure you are up to date on your flu vaccine every year. The pneumonia vaccine is recommended for some adults, especially those over 65 or with chronic health conditions. Ask your doctor if you need it.

Screening programmes

There is no routine screening for chronic cough in people without symptoms. If you have a persistent cough, see your doctor for a check-up rather than waiting for a screening test.

Complications

If left untreated

• Sleep loss and daytime fatigue.
• Muscle strain or rib fractures from severe coughing.
• Social embarrassment and withdrawal from activities.
• Headaches caused by coughing.
• In rare cases, the underlying condition (like lung infection or cancer) may worsen if not diagnosed.

Long-term outlook

The outlook for a chronic cough is very good. Most people find relief once the cause is identified and treated. Even if the cause is more serious, early diagnosis gives you the best chance for effective treatment. You can manage your symptoms and return to normal activities.

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