Multiple sclerosis

**Multiple sclerosis** (MS) is a serious health condition that gets worse over time. In this disease, the body’s natural guard against illness (the immune system) damages fatty coverings called myelin sheaths around the nerve cells (neurons) in the central nervous system (CNS). The disease has different effects in different people, and can make people’s bodies, eyesight, speech, and minds work poorly. People with MS do not normally live as long as healthy people.  Electric signals in neurons move quickly through long, narrow axons like electricity in a wire. 
* Too few vitamins in the body 
* Too much stress in a person’s life Also, some viruses can cause myelin damage, there are other viruses that have been shown to make people more likely to get MS. Even though scientists and doctors have theories, no one has found one cause that explains every case of the disease.

## Symptoms
Quite a few forms of MS exist, which can create difficulty in deciding how to manage the illness. The disease damages myelin. Sometimes, the body can do limited repairs to myelin. When this happens, symptoms (the problems caused by the disease) go away for a short time. This is called remission.  When the body attacks the myelin again, the symptoms return and this is called relapse.  The body may also attack the cells that produce the myelin sheath, called glial cells.

Inflammation is an important part of MS symptoms. Inflammation occurs whenever an injury or illness is detected by the body. It is the first part of an immune system response. In MS patients, inflammation against myelin causes swelling and other harmful effects in the nervous system.  Areas far from the equator get less sunlight than areas near the equator, and the human body requires sunlight to make vitamin D for itself. This observation supports the idea that MS is caused partly by too little vitamin D. People who move from one part of the world to another when they are children are more likely to develop MS than people who do not move long distances until later in life or who never move long distances. A special machine called an MRI can photograph the inside of the central nervous system to show if the person has lesions from damaged myelin. Certain types of neurons can be checked to see how responsive they are. Neurons with damaged myelin around their axons will respond more slowly than normal neurons.

## Treatment
Once a person is diagnosed with MS, a doctor can help ease the symptoms. Scientists have not yet found a way to cure MS, or take it away entirely. The form of MS that comes and goes regularly can be treated more easily than other forms. Some treatments are used only during attacks to make the attacks easier on the patient or to help recovery after the attacks are over.  Other treatments are used all the time to help make attacks happen less often. These kinds of treatments are usually injections or infusions directly into veins, but newer treatments can be taken daily by mouth instead. Some people seek other treatments outside of usual medicine, but these have not been shown in scientific studies to be effective.

## References
## Other websites 
* Multiple sclerosis -Citizendium