Shortness of Breath

Breathlessness is normal on exertion and abnormal when it appears at rest, comes on suddenly, or arrives at a level of activity that never used to cause it.

That last one is the most useful marker and the most commonly ignored — people adjust their lives gradually around it and only notice in hindsight. If you have stopped doing something because of your breathing, that counts.

Lungs — asthma, COPD, chest infection, and less commonly pulmonary fibrosis or a clot on the lung.

Heart — heart failure, which classically causes breathlessness lying flat and ankle swelling; irregular heart rhythms; angina.

Blood — anaemia, which is common, easily tested and fully treatable. Breathlessness on exertion with fatigue and pallor is the classic picture.

Metabolic and hormonal — overactive thyroid, and an excess weight contribution that is often the whole explanation.

Anxiety — panic and hyperventilation are genuine causes, but should be a diagnosis reached after excluding the others, not before.

Deconditioning — the commonest cause of all, and the most reversible.

A consultation covers the pattern — sudden or gradual, at rest or on exertion, worse lying flat, with or without cough, wheeze or swelling. That history narrows it substantially.

We arrange full blood count and ferritin, since anaemia is common and correctable, thyroid function, and chest X-ray where indicated. For suspected asthma we arrange spirometry, which needs an in-person test.

What we cannot do: listen to your chest or measure your oxygen saturation. Both matter here more than in most presentations, so where the picture is at all acute we will direct you to in-person assessment rather than working around it.

How breathless is too breathless?

Use speech as the measure. If you cannot complete a full sentence, call 999. If you can manage only short sentences, or you are breathless sitting still, get assessed the same day. Breathlessness only on exertion, with normal speech, can wait for an appointment — but should not be ignored, particularly if it is new or worsening.

What position helps most?

Sitting upright and leaning slightly forward, with your arms supported on a table or your knees. It lets the accessory breathing muscles work properly and measurably reduces the effort of breathing. People with long-standing lung disease find this position for themselves; most other people never think of it.

Should I use a paper bag if I'm hyperventilating?

No — that advice is outdated and potentially dangerous. If the cause is not actually hyperventilation, rebreathing lowers your oxygen. Slow, deliberate breathing with a longer out-breath than in-breath is safer and works better.

Is a home oxygen monitor worth having?

If you have a lung condition, yes — they are inexpensive and useful. One caveat that matters: pulse oximeters overestimate oxygen levels in people with darker skin, sometimes enough to conceal a genuinely low reading. Never let a reassuring number override how hard you are actually working to breathe.

I only get breathless lying down.

That is a specific and important pattern. Breathlessness on lying flat, or waking in the night gasping and needing to sit up, points towards the heart rather than the lungs — fluid redistributing when you lie down. It is worth mentioning explicitly, because it changes what gets tested.

Could it just be that I'm unfit or overweight?

Possibly, and that is a legitimate explanation — but only after the others have been considered. The pattern that matters is change: if you could manage the stairs six months ago and now cannot, that is worth investigating regardless of your weight or fitness. Anaemia, asthma, heart failure and thyroid disease are all common and all easily tested for.

Can breathlessness be anxiety?

Yes, and it is common — typically with tingling in the hands and around the mouth, a sense of not being able to fill your lungs, and a rapid onset. But anxiety is a diagnosis reached after physical causes have been considered, particularly the first time, and people with anxiety get asthma and clots like everyone else.

When is it a blood clot?

Suspect one with sudden breathlessness, sharp chest pain worse on breathing in, and particularly a swollen or painful calf — or after a long flight, recent surgery, immobility, pregnancy, or starting the combined pill. That combination is a 999 call, not an appointment.