Prosopagnosia, also called face blindness, is a condition where you have difficulty recognising people's faces. There is no treatment, but there are things you can do to help you recognise people.

The main symptom of prosopagnosia is having difficulty recognising faces. You'll still see the parts of a face normally, but all faces may look the same to you.

It affects people differently. Some people may not be able to tell the difference between strangers or people they do not know well. Others may not recognise the faces of friends and family, or even their own face.

Other symptoms of prosopagnosia can include difficulty with:

• recognising emotions on people's faces
• recognising people's age and gender
• recognising characters and following plots in TV programmes or films
• recognising other things, such as cars or animals
• finding your way around

Difficulty recognising faces may make it harder to form relationships, or cause problems at work or school.

This may affect your mental health and may lead to social anxiety or depression.

See a GP if:

There's no treatment for prosopagnosia, but there are things you can do to help recognise people.

Prosopagnosia is caused by a problem with the part of the brain that processes information about faces.

It can happen:

• if you do not develop the ability to recognise faces – this is the most common type and may run in families
• from brain damage, such as following a stroke, head injury, inflammation of the brain (encephalitis), or Alzheimer's disease
• if you're autistic

• Bournemouth University: face blindness research project – find out about taking part in a study
• Face Blind UK: coping strategies
• Coping with depression
• How to cope with anxiety