Shortness of breath: heart, lungs or something else?

Understanding breathlessness

Breathlessness — medically, dyspnoea — is a symptom, not a diagnosis. It means feeling that breathing takes more effort than it should. Because so many body systems can cause it, the details matter more than the sensation itself: how suddenly it started, whether it happens at rest or only with activity, whether lying flat makes it worse, and what else comes with it. This page explains how to work through those details — but if you are struggling to breathe right now, skip ahead to "Is this an emergency?" below.

Breathing brings oxygen into the blood through the lungs and clears out carbon dioxide; the heart then pumps that oxygen-carrying blood to the rest of the body. Breathlessness can come from a problem anywhere along that chain — the airways or lungs themselves, the heart's ability to pump forward or its tendency to let fluid back up into the lungs, the blood's ability to carry oxygen (as in anaemia), the kidneys' fluid balance, or the muscles and nerves that drive breathing. This is why the same symptom in two different people can mean two very different things, and why assessment looks at the whole picture rather than the lungs or heart alone.

What breathlessness can feel like

These are common ways patients describe it, offered to help you put your own experience into words for a clinician — not a checklist for diagnosing yourself.

• ●Getting out of breath during activity that never used to bother you — climbing stairs, walking to the market, everyday chores
• ●Waking suddenly at night gasping or struggling for breath
• ●Needing extra pillows, or to sleep sitting up, to breathe comfortably
• ●A tight, "air hunger" feeling, or a sense of not being able to take a full breath
• ●Wheezing, a persistent cough, chest discomfort or swelling of the ankles and legs alongside the breathlessness
• ●Breathlessness that comes on suddenly over minutes, versus one that has crept up over weeks or months

Note when it happens, what brings it on, how far you can normally walk before it starts, and whether lying flat or lying on one side changes it — this pattern is often the single most useful piece of information for finding the cause.

What causes breathlessness

Grouping causes by the body system involved can help you see where your own experience might fit.

Heart-related causes

Heart failure, where the heart cannot pump or fill effectively and fluid backs up into the lungs; coronary artery disease and heart attack; heart valve problems; and rhythm problems such as atrial fibrillation can all cause breathlessness, often worse lying flat or at night.

Lung-related causes

Asthma, chronic obstructive pulmonary disease, pneumonia, a collapsed lung, and a pulmonary embolism (a blood clot that has travelled to the lungs) are common lung causes, several of which need urgent treatment.

Blood and metabolic causes

Anaemia — a low blood count, common in Nigeria — reduces how much oxygen the blood can carry, forcing faster, harder breathing to compensate. Poorly controlled diabetes and thyroid disease can also contribute.

Kidney-related causes

When the kidneys cannot clear enough fluid, that fluid can build up in the lungs, causing breathlessness — one reason kidney and heart problems are so closely linked.

Weight, fitness and anxiety

Reduced fitness, excess weight, pregnancy and anxiety or panic can all cause a genuine sensation of breathlessness even when the heart and lungs are healthy — a conclusion reached only after other causes are excluded.

Who is more likely to have a heart- or lung-related cause

• ●High blood pressure — very common in Nigeria and often undiagnosed
• ●Diabetes
• ●Anaemia
• ●Smoking or long-term exposure to smoke and fumes
• ●Known heart, lung or kidney disease
• ●A family history of heart disease
• ●Increasing age
• ●Obesity or a sedentary lifestyle

What happens if the underlying cause goes untreated

Persistent, unexplained breathlessness is the body signalling that a system is under strain; ignoring it lets the underlying problem progress.

Worsening heart failure. An unmanaged heart failure cause can progress from breathlessness on exertion to breathlessness at rest, with growing fluid build-up in the lungs and legs.

Falls and reduced independence. Breathlessness that limits activity can lead to deconditioning, reduced mobility and a higher risk of falls.

Respiratory failure. Severe, untreated lung or heart causes can eventually reduce oxygen levels enough to become life-threatening.

Missed serious diagnoses. Because breathlessness is so often blamed on "being unfit" or heat, treatable causes such as anaemia, valve disease or early heart failure can go unrecognised for longer than necessary.

How Cardiocare finds the cause

The right pathway depends on your symptoms, examination and overall health. It typically draws on some or all of the following:

• 01
  History and examination. Onset, triggers, effect of lying flat, and a careful examination of the heart, lungs and legs.
• 02
  Oxygen saturation check. A painless clip on the finger measures how well the blood is carrying oxygen.
• 03
  12-lead ECG. A painless recording of the heart's electrical activity, taking minutes.
• 04
  Chest X-ray. Looks at the lungs, heart size and fluid build-up.
• 05
  Blood tests. Full blood count for anaemia, kidney function, thyroid function and, where relevant, a heart-strain marker.
• 06
  Echocardiogram. A painless ultrasound scan assessing the heart's pumping strength and valves where heart failure is possible.
• 07
  Lung-function testing (spirometry). Measures how well the lungs move air, helping distinguish asthma or COPD from a heart cause.
• 08
  Exercise or stress testing. Assesses breathlessness and the heart's response during controlled activity for selected patients.

How breathlessness is treated

Treatment is matched to the cause found — there is no single treatment for breathlessness as such.

Treating the underlying cause

Correcting anaemia, controlling infection, treating asthma or COPD, or improving heart function each address breathlessness at its source.

Medicines, by class

Where a heart cause is found, medicine is chosen by what it does, and your clinician will discuss the right option and dose for you:

• ●Diuretics ("water tablets") — help the body clear excess fluid from the lungs and legs
• ●ACE inhibitors and related medicines — ease the heart's workload and protect its function
• ●Beta blockers — help a weakened heart pump more efficiently over time

Procedures and support

Where needed, available through Cardiocare's diagnostic and interventional services:

• ●Angioplasty, stenting or bypass surgery — where breathlessness comes from restricted blood flow to the heart
• ●Valve repair or replacement — where a valve problem is the cause
• ●Oxygen therapy and pulmonary rehabilitation — for selected lung conditions

Living with breathlessness: everyday self-care

• ✓Take prescribed medicines consistently, even on days you feel well
• ✓Weigh yourself regularly if you have heart failure — sudden weight gain can mean fluid build-up
• ✓Limit added salt in cooking where advised
• ✓Build activity gradually, as your clinician advises
• ✓Sleep propped up if lying flat makes breathing harder
• ✓Keep a simple diary of what activity brings symptoms on and how far you can comfortably go

During an episode

Sit upright, loosen tight clothing, and try to breathe slowly and calmly. Use any prescribed rescue medicine as directed. Seek urgent help if breathlessness is severe, worsening, or accompanied by chest pain, blue-grey lips or confusion.

Preparing for your appointment

What to bring

• ✓A list of all medicines you take, including herbal and over-the-counter preparations
• ✓Any previous ECGs, blood test results, chest X-rays or hospital letters
• ✓Your HMO card or payment details
• ✓A valid means of identification

What we will ask

When breathlessness started, how far you can walk before it starts, whether it happens lying flat or at night, and what else you notice alongside it, such as swelling, cough or chest discomfort.

Questions worth asking us

• ●What do you think is causing my breathlessness?
• ●Do I need any tests, and what will each involve?
• ●Is my heart, lungs or something else the likely cause?
• ●What should I do if it worsens before my next visit?