Multiple Sclerosis

Multiple sclerosis is a condition that affects the brain and spinal cord, which together form the central nervous system. In MS, the immune system attacks the protective layer (myelin) around nerve fibres, which disrupts the signals passing between the brain and the body. This can lead to problems with movement, sensation, vision and balance. MS is a lifelong condition, and its course differs from person to person.

MS affects more than two million people worldwide. It is most often diagnosed in young and middle-aged adults and is more common in women than in men. It can appear in different patterns and severities, and is more frequent in some parts of the world than others. While it usually begins in early adulthood, it can also be diagnosed at other ages.

Symptoms vary widely depending on which nerves are affected. Common ones include extreme tiredness, vision problems, numbness or tingling, muscle weakness or stiffness, problems with balance and coordination, and difficulties with thinking or memory. Some people have bladder or mood changes. Symptoms may come and go in episodes called relapses, or build up gradually over time, and no two people experience MS in exactly the same way.

The exact cause of MS is not known. It is considered an autoimmune condition, in which the immune system mistakenly attacks healthy nerve coverings. A mix of genetic and environmental factors is thought to be involved, such as family history, low vitamin D, certain infections and smoking. MS is not directly inherited, though having a close relative with MS slightly increases the chance of developing it.

There is no single test that confirms MS. A specialist diagnoses it by reviewing your symptoms and medical history and carrying out a neurological examination. MRI scans are used to look for areas of damage in the brain and spinal cord, and other tests, such as examining the fluid around the spinal cord or measuring nerve signals, may help. Diagnosis often considers how symptoms occur over time.

There is currently no cure for MS, but treatment can help control the condition. Disease-modifying treatments aim to reduce how often relapses happen and to slow the build-up of disability for some types of MS. Other care focuses on relieving specific symptoms and on therapies such as physiotherapy and occupational therapy. A specialist team usually coordinates long-term care and adjusts it to each person's needs.

There is no known way to prevent MS, because its cause is not fully understood. Some research links factors such as low vitamin D and smoking to higher risk, so a healthy lifestyle and not smoking are sensible for overall health. For people who already have MS, taking treatments as advised and managing general health can help reduce relapses and support well-being.