Fewer than one in every 100 people with multiple sclerosis (MS) will experience symptoms before the age of 10 but between two and five in every 100 people experience their first symptoms before the age of 18. Not all of them will have been diagnosed at that age so they may have looked back and recognised certain symptoms as being an early part of their MS.

Tips and information about multiple sclerosis for young people who have been diagnosed with MS under the age of 12

Tips and information about multiple sclerosis for teenagers who have been diagnosed with MS

Clemastine is being investigated for its ability to boost myelin repair. It is currently used as an antihistamine for treating allergies.

Clinically isolated syndrome (CIS) is a first episode of neurological symptoms lasting at least 24 hours. Although some people never go on to experience further neurological symptoms, in others CIS can be the first sign of what may later turn out to be multiple sclerosis.

Clonazepam is used as a treatment for epilepsy. In multiple sclerosis (MS), it is sometimes used to treat tremor, and occasionally pain or spasticity.

Cognitive behavioural therapy or CBT is a form of talking or psychological therapy (psychotherapy). It is used in the treatment of anxiety and depression.

Cognitive reserve is a way of talking about brain health and resilience. It's helpful to boost your cognitive reserve when you have MS, to delay progression and disability.

Co-morbidity means having more than one disease or condition at the same time. Co-morbidities are common among people with MS.