Bronchitis:
symptoms, duration & when antibiotics make sense

Table of contents

1. What is bronchitis?
2. Acute or chronic? The forms
3. Symptoms & how long the cough lasts
4. Causes & risk factors
5. Diagnosis
6. Treatment: what you can do yourself
7. Antibiotics: why usually not — and when after all
8. Chronic bronchitis & the bridge to COPD
9. Everyday life & warning signs
10. How brite helps you
11. FAQ
12. Related topics

A cough that lasts longer than eight weeks, bloody sputum or shortness of breath should always be assessed by a doctor — there may be more behind it than a harmless bronchitis.

1. What is bronchitis?

Bronchitis is an inflammation of the bronchi — the branching airways that carry air from the windpipe into the lungs. During the inflammation, the mucous membrane lining these airways swells and produces more viscous mucus. The body tries to get rid of this mucus again, and that is exactly what causes the main symptom: coughing. Bronchitis is therefore one of the most common causes of acute cough of all.

In the vast majority of cases, acute bronchitis is harmless and heals on its own. It usually develops in the course of a cold, when the viruses spread from the upper airways (nose, throat) further down into the bronchi. This is why bronchitis often begins with a runny nose, a scratchy throat and fatigue before the cough comes to the fore. Important is the distinction from pneumonia: with bronchitis only the bronchial mucous membrane is inflamed, whereas with pneumonia it is the actual lung tissue. The latter is considerably more serious — more on this later under the warning signs.

You can picture the bronchi as a branching system of tubes whose inner wall is lined with a moist mucous membrane. Tiny hair-like cilia normally transport dust and pathogens up and out of the lungs. With bronchitis this cleaning mechanism is disrupted: the mucous membrane is irritated and swollen, the mucus becomes viscous and is harder to transport away. In this situation the urge to cough is actually a useful protective reflex — it moves the secretion outwards. That also explains why you should not suppress a productive cough at any cost.

2. Acute or chronic? The forms

The term bronchitis covers two very different conditions that must be kept clearly apart — they differ fundamentally in cause, duration and significance.

Acute bronchitis is the classic cold-related bronchitis: it comes on suddenly, is almost always caused by viruses and disappears again after a few days to weeks. This is exactly the form meant when people talk about "bronchitis" in everyday life.

Chronic bronchitis is something entirely different. It is defined as a cough with sputum on most days over at least three months in two consecutive years. It does not arise from an infection but from a permanent irritation of the airways — in the vast majority of cases from cigarette smoke. Chronic bronchitis is often the precursor or a component of COPD (chronic obstructive pulmonary disease), in which the airways are also permanently narrowed. This bridge is important: a "smoker's cough" dismissed as harmless can be the first sign of an emerging COPD.

3. Symptoms & how long the cough lasts

By far the most important symptom of acute bronchitis is the cough. It typically progresses in phases:

• Dry, tickly cough at first: distressing, with little or no mucus, often particularly troublesome at night.
• Productive cough later: with sputum. The mucus can be clear, whitish, yellowish or greenish.
• Subsiding phase: the cough becomes less frequent and looser, but can still linger for weeks as a tickly cough.

The signs of the underlying cold often occur alongside it: runny nose, sore throat, headache and aching limbs, mild fever and a general feeling of weakness. Some people feel a burning or raw sensation behind the breastbone that intensifies when coughing.

A common misconception about interpreting the colour of the mucus: yellow or green sputum is no proof of a bacterial infection and is, on its own, no reason for antibiotics. The discolouration is caused by immune cells in the mucus and also occurs with purely viral infections. What matters for the assessment is the overall course, not the colour of the sputum.

During bronchitis, some people also develop a whistling or wheezing sound when breathing out and a feeling of tightness in the chest, because the irritated airways cramp slightly. With pronounced shortness of breath, however, caution is always advised — more on this in the chapter on warning signs.

4. Causes & risk factors

Acute bronchitis is caused by viruses in around 90% of cases — the same pathogens that are also responsible for colds and flu-like infections. These include rhinoviruses, coronaviruses, influenza, parainfluenza and RS viruses, among others. Only a small proportion of acute bronchitis cases are due to bacteria from the outset. This figure is the key to understanding why antibiotics are usually useless here: they only work against bacteria, not against viruses.

Acute bronchitis is contagious via the triggering viruses — usually through droplet and smear infection: by coughing, sneezing or via the hands. This is why the same measures as for any cold help to slow the spread: washing hands regularly, coughing into the crook of your arm and keeping your distance from vulnerable people.

Certain factors increase the risk of developing bronchitis or of a more severe course:

• Smoking: the most important avoidable risk factor — it damages the airways' self-cleaning and prolongs the cough.
• Cold season: infections cluster in autumn and winter.
• Weakened immune system or chronic underlying conditions.
• Pre-existing lung conditions such as asthma or COPD.
• Air pollutants and irritants at the workplace or in the surroundings.
• Very young or older age.

With chronic bronchitis, a single cause dominates: smoking. More than 90% of chronic bronchitis cases in adults are attributable to tobacco smoke. Other triggers are long-term exposure to dust, gases or vapours, for example in certain occupations. Unlike with the acute form, viruses play no causal role here — but they can trigger acute deteriorations (exacerbations).

5. Diagnosis

The doctor usually diagnoses acute bronchitis from the conversation and the physical examination alone — without elaborate equipment. Typical are the course (a cold, then a cough) and listening to the lungs with a stethoscope, which sometimes reveals crackles or a wheeze.

The actual purpose of the examination is less to "prove" the bronchitis than to rule out more dangerous causes — above all pneumonia. To do so, the practice looks out for certain warning signs:

• Listening to the lungs: Crackles on one side or a reduced breath sound can point to pneumonia.
• Measuring pulse, breathing and oxygen: Rapid breathing, a high pulse or low oxygen saturation are warning signs.
• Chest X-ray: Only if pneumonia is suspected or in an unclear, severe course — not routinely.
• Blood tests: Also not standard, but only when warning signs are present, in order to narrow down a bacterial infection or other causes.

If the cough persists unusually long (over eight weeks), other causes are looked for more specifically — such as asthma, chronic bronchitis, reflux, certain blood-pressure medications (ACE inhibitors) or, in smokers, more serious lung conditions. In these cases a lung function test (spirometry) or further examinations may be useful.

6. Treatment: what you can do yourself

Because acute bronchitis is almost always viral and self-limiting, the treatment does not aim to "make the infection go away" but to relieve the symptoms while the body recovers on its own. This symptomatic treatment is the first line — and completely sufficient for most people.^¹

In addition, medicines from the pharmacy can relieve the symptoms. They do not heal the bronchitis any faster but make the time until recovery more bearable. Important: cough expectorants and cough suppressants should not be taken at the same time — one is meant to loosen the mucus, the other to dampen the urge to cough.

7. Antibiotics: why usually not — and when after all

Hardly any point causes as many misunderstandings with bronchitis as the question of antibiotics. The clear, guideline-based answer is: for acute bronchitis, antibiotics are usually not appropriate.^¹,²

The reason is simple: antibiotics only work against bacteria. Acute bronchitis, however, is caused by viruses in around 90% of cases — and against those antibiotics achieve nothing at all. Large studies show that with acute bronchitis antibiotics shorten the cough by less than half a day at best. This tiny benefit, meaningless for everyday life, is offset by real drawbacks:

• Side effects such as diarrhoea, nausea, skin rash or fungal infections.
• Resistance: every unnecessary use promotes bacteria becoming insensitive to antibiotics — a problem for all of us.
• Disruption of the body's own bacterial flora in the gut.

That is why it is no sign of "not being taken seriously" when the practice does not prescribe an antibiotic — on the contrary, it is the medically correct decision. Even yellow-green sputum or a cough lasting two to three weeks is, on its own, no reason for an antibiotic.

If an antibiotic really is needed, active ingredients such as Amoxicillin or — for example with a penicillin allergy or suspicion of certain pathogens — Doxycycline are often used for respiratory infections. Such antibiotics must be taken exactly as instructed by the doctor and for the entire prescribed duration, even if you are already feeling better.

8. Chronic bronchitis & the bridge to COPD

While acute bronchitis is harmless, chronic bronchitis deserves special attention — because it is often the beginning of a more serious development. It is defined as a productive cough (with sputum) on most days over at least three months in two consecutive years, without another cause being behind it.^³

The decisive difference from COPD lies in the narrowing of the airways. With pure chronic bronchitis the airways are still clear — there is "only" the persistent cough with mucus. If a permanent, not fully reversible narrowing of the bronchi is added, this is called COPD. The transition is fluid, and chronic bronchitis is regarded as an important precursor. That is why it is a warning signal that should be taken seriously before lasting damage occurs.

By far the most important measure for chronic bronchitis is stopping smoking. It is the only treatment that can effectively slow the progression towards COPD — at any stage. Even those who have smoked for decades benefit from quitting. In addition, protection from pollutants, exercise, vaccinations (for example against flu and pneumococci) and — where airway narrowing already exists — bronchodilator medications such as Salbutamol for treatment are all part of it. How COPD is treated in detail can be read in the separate article on COPD.

9. Everyday life & warning signs

Most cases of bronchitis can be nursed back to health at home. A few things help to support recovery and to avoid infecting others:

• Patience with the cough: up to three weeks of coughing is normal — don't try a new medicine for every tickly cough.
• Avoid infecting others: wash your hands, cough into the crook of your arm, keep your distance from vulnerable people.
• Don't smoke: neither actively nor passively — smoke prolongs every cough.
• Listen to your body: if there is a deterioration, high fever or shortness of breath, seek medical advice instead of waiting.

How brite helps you with bronchitis

With bronchitis, it is above all about keeping an eye on the course, taking medications correctly and recognising in good time when a doctor's visit is needed. That is exactly what brite supports.

• Intake reminder — take cough remedies, fever reducers or a prescribed antibiotic on time and without gaps. Set up a reminder
• Health record — document how long your cough has been going on and how fever and symptoms develop. This lets you see when the eight-week mark is approaching. Track the course
• Interaction check — checks whether your cough and cold remedies clash with other medications, for example with long-term medication. Check now
• Digital medication plan — all preparations clearly laid out for your GP, lung specialist and pharmacy. To the medication plan

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11. Related topics