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How can hot weather affect multiple sclerosis (MS) symptoms?

As many as 60 to 80 percent of people with multiple sclerosis (MS) experience difficulty in a warm environment. When their body temperature rises, weakness, fatigue, visual disturbances, and other MS symptoms can become aggravated. While heat does not actually make MS itself worse, it does alter the passage of nerve impulses, causing a feeling of weakness, especially in the limbs. This is known as a "pseudo exacerbation;" no permanent damage is done but it can make it hard to work or have fun in warm situations.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.