People with MS have times when they get new symptoms or their old symptoms become worse. When this happens it is called a relapse. Relapses are also called flare-ups, flares, attacks, or exacerbations. They are caused by inflammation in the central nervous system. The inflammation causes demyelination. Demyelination slows the transmission of nerve impulses, which causes the symptoms of MS.
MS relapses are separated by at least 30 days. A relapse lasts at least 24 hours, but can go on for a few days, weeks, or even months.
Causes of a Relapse
Many possible causes have been suggested for relapses. Relapses may be more common after a viral infection or upper respiratory infection. They may occur slightly more often in women in the three months after pregnancy.
Relapses are unpredictable and mostly occur without warning. Staying on track with MS treatment is the best way to deal with the threat of relapses. People who are on treatment for their MS may have fewer relapses than those who don't.
Reducing the number of relapses you have may help delay permanent future disability. That's one of the reasons why it's so important to find the most effective MS medication for you.
More about MS progression
