Cyanosis is where your skin or lips turn blue. It can be a sign of a serious problem.
You may notice a blue colour on your:
If you have dark skin, cyanosis may be easier to see:
Your hands and feet are usually a normal temperature unless you also have poor blood circulation.
Cyanosis can mean there's not enough oxygen in your blood, or you have poor blood circulation. It can be caused by a serious problem with the:
Other causes of cyanosis include:
Cyanosis is a symptom of many different conditions.
Treatment depends on the cause.