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    When Hyperhidrosis Means Something Serious

    By Anna Nguyen
    WebMD Feature
    Reviewed by Louise Chang, MD

    Did you recently start excessively sweating even in comfortable temperatures? Do you wake up at night soaked in sweat?

    These may be signs of secondary hyperhidrosis -- excessive sweating due to medications or a medical condition.

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    Normally, your body sweats to regulate its temperature, and you sweat more during exercise, hot conditions, and stressful situations. Your body cools down as sweat evaporates from the skin.

    With secondary hyperhidrosis, your sweat glands overreact throughout the body due to medications or a medical condition, producing more sweat than is necessary.

    Signs of Secondary Hyperhidrosis

    Heavy sweating that’s new and unusual after age 25 is often caused by a health condition or a medication, says Dee Anna Glasser, MD, professor and vice chairman director cosmetic and laser surgery in the department of dermatology at Saint Louis University in St. Louis.

    Here are other symptoms or signs that you may have secondary hyperhidrosis:

    • No one else in your family sweats heavily.
    • Sweating occurs all over your body or in large areas of the body
    • You also have fatigue, headaches, or other symptoms.
    • You sweat heavily when sleeping at night (night sweats) or when eating.

    Common Causes of Secondary Hyperhidrosis

    Many medications can cause secondary hyperhidrosis, but so can a host of medical conditions, from anxiety to rheumatoid arthritis. So, it's important to see a dermatologist who understands the problem and all its causes, says Kelley Redbord, MD, FAAD, associate clinical professor at George Washington University in Washington, D.C.

    "We’ll ask patients questions about medical history, and a list of medications and supplements. These can be over the counter, prescription, and herbal," Redbord says. Even simple substances such as iron supplements may cause secondary hyperhidrosis. If your primary care doctor isn’t familiar with hyperhidrosis, Redbord recommends seeing a medical professional who is knowledgeable about it. “You want to see someone knowledgeable about hyperhidrosis. If you go to primary care doctor, they might not be familiar with it,” she says.

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