Persistent Respiratory Symptoms in Young Adults
When cough, wheeze or haemoptysis needs more than an inhaler

• Carcinoid is the commonest primary lung tumour in young adults. Rare overall (about 1–2% of lung tumours), but the first structural diagnosis to consider in a young patient with airway symptoms.
• Any haemoptysis in a young adult warrants cross-sectional imaging. However small — including dark streaks — and regardless of a normal chest X-ray.
• A normal or “longstanding-looking” chest X-ray does not exclude a central airway lesion. Early endobronchial tumours are radiographically occult; volume loss, a raised hemidiaphragm or lobar collapse are late signs.
• Treatment-resistant “asthma” is a red flag, not a dosing problem. Localised or monophonic wheeze and an incomplete response to good inhaler therapy should prompt reassessment for a structural cause.
• Rigid bronchoscopy gives definitive diagnosis and immediate airway control. The American College of Chest Physicians 2025 guideline recommends it for therapeutic intervention in central airway obstruction; the service runs single-operator at Guy’s and St Thomas’ and London Bridge Hospital.

Primary lung tumours are uncommon under the age of 30, but they are not absent — and the histological mix is quite different from the smoking-related cancers that dominate older practice. The commonest primary lung tumour in children, adolescents and young adults is the bronchopulmonary carcinoid, a low- to intermediate-grade neuroendocrine tumour that accounts for only about 1–2% of all lung tumours overall. Alongside it sit the salivary-gland-type airway tumours — adenoid cystic carcinoma and mucoepidermoid carcinoma — which, like carcinoid, tend to arise centrally within the trachea or main bronchi.

Two features of this group matter for the referrer. First, these tumours are largely unrelated to smoking and show, for carcinoid, a slight female predominance — so a young, non-smoking woman is a typical rather than an atypical patient. Second, because they are usually central and slow-growing, they obstruct an airway gradually and present with cough, wheeze, recurrent infection and haemoptysis rather than with a discrete peripheral mass. Non-tumour structural causes — pulmonary sequestration, congenital bronchial anomalies, a retained foreign body, localised bronchiectasis or an arteriovenous malformation — can produce a similar picture and are part of the same differential. The detail of each tumour, and the operations used to treat them, is set out in rare lung and chest tumours; this page is about the step before diagnosis — recognising when to look.

A normal chest X-ray is the most common reason these diagnoses are falsely closed down. The plain film is a projectional image, and a tumour sitting inside the lumen of a bronchus — even one large enough to cause symptoms — can be entirely hidden against the mediastinum and the overlying vessels. In the early phase the film is often genuinely normal.

When the X-ray does change, it usually does so indirectly, through the consequences of obstruction rather than the tumour itself. The first visible signs are signs of volume loss: a subtly raised hemidiaphragm, a small area of segmental collapse, or loss of clarity of a lobar border. These are easily reported as “may be longstanding” or passed over as unremarkable, particularly in a young patient in whom serious disease is not expected. Left unaddressed, the same process advances to lobar and then whole-lung collapse — by which point the diagnosis is unmissable, but the opportunity for the least extensive treatment has narrowed. The practical conclusion is that the decision to image cross-sectionally should rest on the symptom pattern, not the radiograph: in a young adult with persistent symptoms or any haemoptysis, a normal or equivocal chest X-ray is a reason to obtain a CT, not a reason to stop.

Haemoptysis is the single most useful symptom in this group, because it is never a feature of uncomplicated asthma and is one of the most common presenting symptoms of a central airway tumour. The volume is not reassuring when it is small: carcinoids are vascular, and an early lesion frequently announces itself as intermittent blood-streaking of the sputum rather than as a dramatic bleed. The instinct to attribute a small amount of blood to a chest infection, and to treat with a further course of antibiotics, is precisely how these tumours are missed.

For a young adult, the appropriate response to haemoptysis of any volume is a CT thorax and specialist referral, regardless of a normal chest X-ray and regardless of an existing label of asthma. Repeat plain films and repeat antibiotics are not an adequate substitute. The patient-facing companion to this page — coughing up blood (haemoptysis) — explains the same message in lay terms for patients who arrive by self-referral, and persistent cough covers the broader symptom. Where bleeding is heavier, interventional radiology with bronchial artery embolisation is the usual first-line measure, with rigid bronchoscopy providing definitive airway control where embolisation fails or the underlying lesion requires resection.

Disclosures

This page is referrer and patient information, not medical advice for any individual case. Mr Lawrence Okiror is a Consultant Thoracic and Robotic Surgeon at Guy’s and St Thomas’ NHS Foundation Trust, with private practising privileges at London Bridge Hospital and The Lister Hospital Chelsea. He is first author on the published bronchoscopy series cited in the page schema. He has no commercial relationships relevant to this content. Decisions about imaging, referral and treatment should be made on a case-by-case basis after appropriate clinical evaluation.