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In this episode, we meet Kirsty, a young, fit and healthy mum, who is suddenly paralysed and incontinent. Multiple tests are unable to find any obvious cause. She is eventually diagnosed with functional neurological disorder (FND) - where the structure of the brain is entirely normal, but the way it functions goes awry. Its origins are in her childhood and more recent psychological trauma.

We also hear from Callum, who, almost overnight, develops seizures and walking difficulties. Again, no clear neurological cause can be found. His symptoms have been triggered by a viral illness. We learn how FND is not always associated with stress or trauma, but can be related to physical illness.

And we speak to Daljit, whose memory issues, jerking and stuttering lead to his wife's discovery of his dark and traumatic past experiences.

We’ll hear from psychiatrists and neurologists about what we understand about the nature and origins of FND, and how these symptoms are not "psychosomatic" or "all in your head". And how early recognition and diagnosis can lead to full recovery.

Presenter: Professor Guy Leschziner
Producer: Sally Abrahams
Sound: Rod Farquhar

Production co-ordinators: Maria Ogundele and Helena Warwick-Cross
Editor: Clare Fordham

Image: Amy Hiley amyhileyart.com