Transient temperature-dependent numbness, weakness, or loss of vision. Conduction stops in any nerve if the temperature gets too high. In a damaged nerve, e.g., by demyelinization, this shutdown temperature is lowered, and may approach normal body temperature. Transient neurological dysfunction may then appear with a hot shower, exercise, or fever.
Some Facts: About 80% of patients with MS are heat sensitive, Small increases in body temperature can slow nerve signals significantly. Existing symptoms often get worse with heat and new symptoms can emerge
THE GOOD NEWS: This is a temporary deterioration which improves when the body temperature returns to normal. When the body temperature is reduced slightly below normal noticeable improvements in symptoms can occur Symptoms of MS which can improve with cooling: abnormal fatigue, physical performance, coordination and balance, spasticity, cognitive abilities or thinking abilities, blurred vision, slurred speech bladder and bowel control.
Cooling Vest Improves Symptoms for MS Patients Wearing a cooling vest can help MS patients with muscle strength, fatigue and balance, according to a study published in Neurology, the scientific journal of the American Academy of Neurology. "This is exciting, because it's a relatively easy treatment that brings an immediate benefit", said author and neurologist Jacque De Keyser, MD, PhD of the University Hospital in Groningen, Holland.

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