Multiple sclerosis (MS) is a disease affecting nerves in the brain and spinal cord, causing problems with muscle movement, balance and vision. Each nerve fibre in the brain and spinal cord is surrounded by a layer of protein called myelin, which protects the nerve and helps electrical signals from the brain travel to the rest of the body. In MS, the myelin becomes damaged.
This disrupts the transfer of these nerve signals, causing a wide range of potential symptoms, such as:
- loss of vision – usually only in one eye
- spasticity – muscle stiffness that can lead to uncontrolled muscle movements
- ataxia – difficulties with balance and co-ordination
- fatigue – feeling very tired during the day