Dry cough during chemotherapy

A dry cough during chemotherapy usually has one of three causes, and each has a different level of urgency. The most common is a chest infection, which can become serious quickly when blood counts are low. The second is inflammation of the lungs caused by the treatment itself, which is less common but important to catch early. The third is everyday causes such as a cold, allergies, acid reflux, dry air or a medicine side effect, which are usually mild.

You cannot reliably tell these apart at home. A cough with fever or shivering needs the same urgent response as any fever during chemotherapy. A dry cough with growing breathlessness, even without fever, needs same-day assessment because treatment-related lung inflammation responds best when treated early. A mild cough with a runny nose and no breathlessness can often be watched, but should still be mentioned to your team.

Infection is the first worry

Low white cells reduce your ability to fight chest infections, which can worsen within hours.

Lung inflammation can be silent at first

It often starts with a dry cough and breathlessness on effort, sometimes with a low fever, weeks into treatment.

Other causes are common too

Reflux, post-nasal drip, dry air from air conditioning and some blood pressure tablets can all cause a lingering cough.

It cannot tell you what is causing your cough. That needs an examination, and often blood tests, a chest X-ray or a CT scan, and sometimes a test of oxygen levels or lung function. Only your team can decide which tests are needed.

It also cannot tell you whether to continue your treatment. If lung inflammation is suspected, treatment may be paused and steroids given, but this must be decided by your oncologist.

Which treatments can affect the lungs

Bleomycin, some targeted tablets, immunotherapy, and radiotherapy to the chest are the treatments most often linked with lung inflammation.

Lung effects can appear later

Treatment-related inflammation can start weeks after a dose, or even after treatment has finished. Mention a new cough to any doctor.

Oxygen treatment needs care after bleomycin

If you have had bleomycin, tell any doctor or anaesthetist before surgery or oxygen treatment.

Smoking makes lung effects worse

Stopping smoking protects the lungs during and after treatment. Ask your team for support.

Children and older adults

Children may breathe fast rather than complain, and older adults may become confused rather than feverish. Watch for these changes.

Covid and flu are possible

Viral infections cause dry coughs too. Your team may test for them, and vaccination advice will be given where suitable.

A lingering cough still deserves review

A cough lasting more than a couple of weeks, even if mild, should be checked.

Pulse oximeters can help, with care

A finger oxygen monitor can give useful information, but readings can be wrong with cold hands or nail polish. Use it alongside how you feel, and never let a normal reading stop you from reporting breathlessness.

Family can watch your breathing

Relatives may notice fast breathing, difficulty finishing sentences or blue lips before you do. Ask them to act quickly if they see these signs.

Note what makes the cough worse

Coughing that is worse lying down, after meals, in cold air or on exertion gives useful clues. Tell your team what you have noticed, as it helps them decide which tests are needed.

Rest your voice and throat

Long conversations and shouting irritate a sore throat. Rest your voice when you can, and keep water nearby to sip whenever a coughing spell starts.

What to do next

Check your temperature when a cough starts. Treat cough with fever as an emergency, report a dry cough with breathlessness the same day, and mention milder coughs to your team. Avoid smoke and dust, keep the throat moist, and ask before taking cough syrups.