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What do purple lips mean?

It is usually a sign of low levels of oxygen in the blood. Common causes for central cyanosis are listed below. A problem with the lungs: worsening of a long-term lung condition, such as asthma or chronic obstructive pulmonary disease (COPD) lung infections, such as pneumonia, bronchiolitis or whooping cough.

nidirect.gov.uk - Blue skin and lips (cyanosis) | nidirect
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Blue skin and lips (cyanosis)

Blue skin and lips is usually caused by low blood oxygen levels or poor circulation. It can be a sign of a serious problem. Call 999 or go to your nearest emergency department immediately if you notice an adult or child suddenly turning blue.

When to seek emergency help

Call 999 or go to your nearest emergency department immediately if you notice an adult or child suddenly turning blue.

This is particularly important if they have other symptoms, such as:

difficulty breathing

chest pain

This could be a sign of a life-threatening problem.

When to see your GP

See your GP if you have cyanosis that:

comes on very gradually

affects just the fingers, hands, toes or feet

This is usually the result of a less serious problem with blood circulation, but it should still be checked by a doctor.

Common causes of cyanosis

When blood has less oxygen than normal, it changes from bright red to darker in colour, making the skin and lips look blue. Some of the main causes of cyanosis are described below. You shouldn't use this to diagnose yourself. You should always leave that to your GP.

Cyanosis that just affects the hands, feet or limbs

If just the fingers, toes or limbs have turned blue and feel cold, it's known as peripheral cyanosis. It can be caused by being exposed to cold air or water. Other causes include poor circulation resulting from:

Cyanosis that affects the skin generally and/or lips

When all the skin and/or lips have a blue tinge, it's known as central cyanosis. It is usually a sign of low levels of oxygen in the blood. Common causes for central cyanosis are listed below.

A problem with the lungs:

A problem with the airways:

A problem with the heart:

Other causes:

exposure to cold air or water

being at high altitude

fits (seizures) that last a long time

a problem with the blood, such as abnormal haemoglobin (the blood can't take up enough oxygen) or a high concentration of red blood cells (polycythaemia)

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