LOS ANGELES (CBS) — Some doctors call fibromyalgia the “invisible” illness because the people suffering from it look completely fine and healthy.

Just trying telling the people who have fibromyalgia that they are fine.

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To those who suffer with it, a handshake can be excrutiating.

It is one of this country’s most chronic illnesses — some five million Americans are said to be afflicted. And…the vast majority of those people, 80-90 percent by some estimates…are women.

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Lynne Matallana, president and founder of the National Fibromyalgia Association, and Dr. Hernan Castro-Rueda, were in-studio guests on the KCAL 9 News at 2PM Monday, to discuss fibromyalgia, its signs and its symptoms.

They were also on hand to discuss a free educational seminar to be held on the topic on October 23 in Mission Viejo.

Called Fibro Focus, the event will be held at 3 pm. at the Norman P. Murray Community & Senior Center, 24932 Veterans Way, 92691.

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For more information about fibromyalgia, click on the following link: http://www.fmaware.org/site/PageServer