MS, or Multiple Sclerosis, is a challenging condition with which to live. There are several different forms of MS. In some cases, symptoms are present all the time and get progressively worse. In other cases, the symptoms tend to come and go in periods of remissions and exacerbations. Exacerbations are sometimes called flares, relapses or attacks. An important step in managing this condition is identifying the factors that cause MS exacerbations, and then taking steps to minimize exposure.
Central Nervous System Inflammation
According to the Multiple Sclerosis Society, an exacerbation is an increase in symptoms that lasts at least 24 hours. It must occur no sooner than 30 days after your last attack. However, some exacerbations can last for weeks or months. No matter what the trigger is, an exacerbation occurs when the central nervous system becomes inflamed and damages the myelin, or covering, that protects the nerves. In most cases, exacerbations occur as a natural part of the disease process and happen with no identifiable trigger or cause. Much more research is still needed, as there is very little information about what actually causes MS and the disease's progression.
Flu Virus
Individuals with MS should consult a physician about getting a flu vaccination because this illness can make MS symptoms worse, states the Multiple Sclerosis Association of America. Exposure to heat and high temperatures tends to make symptoms flare, so any illness that is associated with a fever can be dangerous. Having the flu means even more aches and pains than usual for those with MS. In addition, the MSAA claims that "...the body responds to the flu with an outpouring of gamma interferon, a chemical that increases the risk of an MS exacerbation." Exacerbations can happen even weeks after the flu subsides. The best defense is to take steps to prevent the flu. This means good hand washing habits, avoiding crowded areas during flu season, and not touching the eyes or face after any possible exposure to the flu virus.
Humidity and Infections
Certain conditions can cause what the National MS Society labels as "pseudo-exacerbations." These are circumstances that make the symptoms of MS get worse, yet do not cause permanent damage. The symptoms usually get better on their own, versus a "true" exacerbation that requires treatment. Exposure to high heat and humidity can slow nerve impulses and cause symptoms. A pseudo-exacerbation can also occur if you exercise hard and overheat the body, or when fighting off an infection such as a urinary tract infection. While none of these situations have been proven to actually cause an MS exacerbation, they can contribute to how the body feels overall with this disease.


