Coughs are one of the most common reasons people visit their GP – and understandably so.
Whether it’s dry and persistent, productive, or worse at night, a lingering cough can be worrying and disruptive.
At Kent Family Medical, we regularly see patients with concerns about how long coughs last, whether they’re contagious, and when they need medical attention.
This guide breaks down the most common causes of cough, what different types of coughs might mean, and when to seek professional advice.
Different Types of Coughs and What They Mean
1. Viral Infections
Common cold viruses are the most frequent cause of cough. You may have cold symptoms like a sore throat, congestion, or fatigue, or simply a lingering dry or chesty cough.
No antibiotics are needed, but rest, fluids, and over-the-counter remedies may help ease symptoms.
When to see a GP: If the cough lasts longer than 3 weeks, or you’re feeling unwell, breathless, or have a fever that won’t settle.
2. Asthma and Allergies
A persistent dry cough, especially at night or after exercise, could be a sign of asthma, even without classic wheezing.
People with asthma often have a family or personal history of hay fever, eczema, or allergies (known as atopy).
You may notice coughing episodes after exposure to dust, pollen, pets, or cold air.
Asthma-related coughs often respond well to inhalers. A simple breath test can confirm the diagnosis.
3. Smoking and COPD
Smokers often develop a chronic cough due to damage to the airways.
In some cases, this may be the first sign of Chronic Obstructive Pulmonary Disease (COPD), which includes conditions like chronic bronchitis and emphysema.
A simple lung function test can help diagnose COPD. If you’re a smoker with a cough lasting more than 6 weeks, seek a review.
Stopping smoking is the most effective way to slow disease progression. Vaping is sometimes used as a smoking cessation aid, but long-term risks to lung health remain uncertain.
4. Post-Nasal Drip and Sinusitis
Ongoing nasal congestion or sinus issues can cause mucus to drip down the back of the throat, leading to a tickly, irritating cough. This is often worse at night or first thing in the morning.
5. Acid Reflux (GORD)
Stomach acid rising into the oesophagus can irritate the throat, causing a chronic dry cough.
This may be worse after meals, when lying flat, or during the night. It’s often accompanied by heartburn or a sour taste in the mouth.
6. Medication Side Effects
Some medications – especially ACE inhibitors (like Ramipril) used for blood pressure – can cause a persistent dry cough as a side effect.
If you’ve started a new medication and developed a cough, let your GP know.
What Is the ‘100-Day Cough’?
The term “100-day cough” is being used more frequently, especially in the post-pandemic era, as viral coughs seem to linger longer than usual.
However, it’s also associated with Whooping Cough (Pertussis) – a highly contagious bacterial infection.
Cases are rising in the UK, partly due to reduced vaccine uptake. Whooping cough can cause prolonged bouts of violent coughing and is especially dangerous in young babies.
Adults and teenagers can carry and spread the infection even with mild symptoms.
Vaccination is available for infants, children, and pregnant women (between 20 and 32 weeks) to protect newborns.
How Long Do Coughs Last?
Most coughs caused by a viral infection (like the common cold or flu) will improve within 3 weeks.
In some cases, they may linger for up to 6 weeks, especially after viral bronchitis. If a cough lasts longer than 3 weeks, it’s worth discussing with a GP.
Any cough persisting beyond 6 weeks should be assessed in more detail.
Are Coughs Contagious?
Coughs caused by viral or bacterial infections are contagious, especially in the early days when symptoms first appear.
You can spread germs through droplets in coughs and sneezes, which is why hand hygiene, mask use (if unwell), and staying home when necessary are still important measures.
Non-infectious causes of cough, such as asthma or acid reflux, are not contagious.
Why Are Coughs Worse at Night?
Many people notice their cough is worse at night. This can happen for several reasons:
- Post-nasal drip from allergies or sinusitis irritates the throat more when lying down.
- Acid reflux is often more prominent when reclined, triggering a dry or tickly cough.
- Asthma-related cough tends to worsen at night due to changes in airway sensitivity and temperature.
If your cough is consistently worse at night, a GP review can help uncover the cause and offer targeted treatment.
When Should You See a GP About Your Cough?
We recommend seeking a medical review if:
- Your cough lasts more than 3 weeks, especially if it’s getting worse.
- You’re short of breath, wheezing, or breathing faster than normal.
- You’re coughing up blood (even a small amount).
- You have a history of smoking and are over 40, particularly if you feel tired, breathless, or have chest pain.
- You have a chronic condition (e.g., asthma, COPD, heart disease).
- The cough is interfering with sleep, daily life, or work.
Private GP Support for Coughs
At Kent Family Medical, we offer same-day appointments, lung function testing (spirometry), FeNO breath testing, and access to chest imaging if required.
Whether you’re dealing with a nagging post-viral cough or are concerned about something more serious, we’ll help you get the answers and treatment you need, without long waits.
Book a consultation today for prompt, personalised care.