Understanding shortness of breath
Shortness of breath, known medically as dyspnoea, is the sensation of not being able to breathe in enough air. It can range from mild and brief to severe and frightening. Everyone experiences breathlessness at times — after climbing stairs, exercising, or at high altitude — and in these situations it is a normal response that settles with rest.
Breathlessness becomes a concern when it is unexpected, comes on suddenly, is severe, happens with little or no exertion, or occurs at rest. Because breathing involves the heart, lungs and other systems working together, shortness of breath can have many causes, ranging from minor to serious. Understanding when it is normal and when it needs attention is the key thing.
Common causes
Shortness of breath can arise from the lungs, the heart, or other factors. Common causes include:
- •Being unfit or out of shape, or carrying excess weight
- •Anxiety and panic, which can cause rapid breathing
- •Asthma and other lung conditions
- •Chest infections, colds and flu
- •Allergies
- •Anaemia (low levels of healthy red blood cells)
- •Heart conditions
- •Being at high altitude
When breathlessness is an emergency
While much breathlessness is not dangerous, certain situations are medical emergencies and need immediate help. Call emergency services if shortness of breath comes on suddenly and is severe, if you are struggling to breathe or speak, or if it occurs alongside chest pain, especially pain spreading to the arm, jaw or back.
Other emergency signs include lips or fingers turning blue, fainting or feeling like you might pass out, and a fast heartbeat with severe breathlessness. Sudden breathlessness with a swollen, painful leg can suggest a blood clot that has travelled to the lungs, which is also an emergency. When in doubt about severe or sudden breathlessness, it is always safest to seek urgent help rather than wait.
Longer-term and recurring breathlessness
Not all breathlessness is an emergency. Many people experience breathlessness that builds up gradually, comes and goes, or occurs with particular activities. This kind of breathlessness still deserves attention, as it can be a sign of conditions such as asthma, heart problems, anaemia or being out of shape, all of which benefit from being identified and managed.
If you find yourself getting breathless more easily than before, breathless with everyday activities you used to manage comfortably, or waking at night feeling breathless, it is worth seeing a doctor. They can examine you, run tests if needed, identify the cause, and recommend treatment. Many causes of ongoing breathlessness are very treatable, and addressing them can greatly improve how you feel and what you are able to do.
Living with ongoing breathlessness
For people who experience ongoing breathlessness from a known condition such as asthma, a heart condition or a long-term lung condition, learning to manage it day to day can make a real difference to quality of life. The starting point is always working with a doctor to treat the underlying cause as effectively as possible, as good control of the condition itself usually improves breathlessness.
Alongside this, several approaches help. Staying as active as possible, within safe limits and ideally with guidance, helps maintain fitness and can actually reduce breathlessness over time, even though it may feel counterintuitive. Maintaining a healthy weight reduces the demand on the heart and lungs. Stopping smoking is one of the most beneficial steps for anyone with breathlessness, as it improves lung function and slows the progression of many conditions.
Breathing techniques and positions can also ease breathlessness in the moment — for example, sitting upright and leaning slightly forward, and using slow, controlled breathing. For some long-term conditions, structured programmes such as pulmonary rehabilitation teach these skills and build confidence. A doctor or specialist nurse can advise on what is suitable.
Breathing techniques and staying calm
Breathlessness and anxiety often feed into each other: feeling short of breath is frightening, which can trigger anxiety, which in turn worsens the breathlessness through faster, shallower breathing. Learning to break this cycle is valuable, particularly for people whose breathlessness is linked to or worsened by anxiety.
Slow, controlled breathing helps calm both the breathing and the mind. One simple approach is to breathe in gently through the nose and out slowly, making the out-breath longer than the in-breath, which helps the body relax. Pursed-lip breathing — breathing out slowly through lips held as if about to whistle — can also ease breathlessness for some people.
Staying as calm as possible, finding a comfortable position, and focusing on slow breathing can help an episode of breathlessness settle. That said, it is important to distinguish manageable breathlessness from the sudden, severe breathlessness that signals an emergency. When breathlessness is new, severe, or accompanied by warning signs like chest pain, the priority is always to seek urgent medical help rather than trying to manage it alone.