By Angela Haupt for U.S. News Health

Headache? It must be a brain tumor. Bruise on your leg? Leukemia. Slightly nauseous? Either cancer or a heart attack.

Welcome to the life of a hypochondriac.

We've become a nation of them, says Catherine Belling, an assistant professor of medical humanities and bioethics at Northwestern University's Feinberg School of Medicine. In her new book "A Condition of Doubt: The Meanings of Hypochondria", she explores our increasing anxiety about our health, as well as the way hypochondriacs are perceived by the public and their doctors. "Hypochondria is not a mental illness, so much as it is an extremely irrational response to the uncertainty of medicine," she says. "We think of these people as silly, as demanding attention they don't really need. But no doctor can ever tell you that you're 100 percent healthy and will be forever. It causes a lot of misery and becomes a real nightmare for patients and doctors."

People who suffer from hypochondria make frequent doctors' appointments, insist on unnecessary tests, and see physical illness where medicine says there is none. They fret needlessly over diseases that procedures prove they don't have. They're obsessed with the idea that a disease is lurking, awaiting the right doctor and diagnosis. They experience ordinary discomforts more intensely than others, sinking often into a full-blown panic. They grow angry with physicians who fail to acknowledge sinister symptoms.

One driving factor, Belling argues, is that we're constantly being bombarded with messages telling us we might be sick, even if we have no symptoms. Public health pushes call for disease awareness months and an emphasis on early detection and screening; people are overly alert to symptoms and eager to get tested. "It's a massive contributor," she says. "We're being trained to think like hypochondriacs: 'Just because I feel fine, doesn't mean there's not something developing inside me right now.'"

Hypochondria affects about one out of every 20 Americans. Here's how to cope, or at least better manage it.

Loading Slideshow...
  • Stay Offline

    Dr. Google is full of diagnoses -- plenty of them wrong. Enter a symptom, say, stomach pain, and you'll learn you could have anything from appendicitis to esophageal cancer. And if it's the latter? Well, the outlook is bleak. "People find themselves a lot more anxious after checking these sites," says Brian Fallon, director of the Center for Neuroinflammatory Disorders and Biobehavioral Medicine at Columbia University. Some hypochondriacs, he says, spend hours a day trolling the Web, to the point that it interferes with their daily functioning. "They become so preoccupied and anxious about what they're reading," Fallon says. "Someone with a predisposition to health anxiety can do themselves a huge favor by staying off the net." <strong>More from U.S. News:</strong> <a href="http://health.usnews.com/health-news/articles/2012/05/02/are-you-sitting-yourself-to-death" target="_hplink">Are You Sitting Yourself to Death?</a> <a href="http://health.usnews.com/health-news/articles/2012/04/27/can-your-mental-health-affect-your-longevity" target="_hplink">Can Your Mental Health Affect Your Longevity?</a> <a href="http://health.usnews.com/health-news/articles/2012/04/20/your-guide-to-exercising-through-the-ages" target="_hplink">Your Guide to Exercising Through the Ages</a> <em>Flickr photo by <a href="http://www.flickr.com/photos/untitled13/82365532/" target="_hplink">the prodigal untitled13</a></em>

  • Stick With One Doctor

    Doctor hopping isn't helpful. But hypochondriacs are inclined to do so -- if one doesn't see anything wrong, they assume, the next one will. Going from one doc to the next increases the likelihood of different diagnoses and unnecessary tests. Find one who you trust, and don't make a change, Belling says. Try to create a good relationship with him, too. Be open and honest about your concerns and struggles. The right doctor will be supportive and will help direct your attention away from symptoms. "Hypochondriacs need to realize that that one perfect doctor who can find everything or cure everything doesn't exist," Belling says.

  • Forget The Self-Checks

    Obsessively monitoring your pulse? Blood pressure? Temperature? Put the at-home medical devices away. Focus on something aside from your body -- it's much healthier and more productive. <em>Flickr photo by <a href="http://www.flickr.com/photos/pyxopotamus/4074609498/" target="_hplink">me and the sysop</a></em>

  • Join A Support Group

    Connect with others who share similar concerns. You can swap knowledge and coping strategies, provide reassurance, and answer each other's questions. And it helps to know that you're not alone. <em>Flickr photo by <a href="http://www.flickr.com/photos/mosmancouncil/6236367067/" target="_hplink">Mosman Council</a></em>

  • Be Active

    Exercising helps ease stress, depression and anxiety. No need for it to be intense, either: walk the dog, go swimming or do some gardening. Stress makes sufferers feel more anxious, and may also exacerbate symptoms they already have. <em>Flickr photo by <a href="http://www.flickr.com/photos/magnusbrath/5736323725/" target="_hplink">Magnus Bråth</a></em>

  • Cognitive Behavioral Therapy (CBT)

    It's designed to help you recognize -- and stop -- behavior that's linked with your anxiety. Sometimes it includes exposure therapy: directly confronting and learning to cope with your fears. "If someone won't go to cancer hospitals because they're afraid they're going to get cancer, we take them there," says Jon Abramowitz, a professor of psychology with the University of North Carolina Clinical Psychology Program. "Or they won't exercise because they think it will blow out their heart, so we make them do it." Research suggests CBT is effective; patients typically need about 16 to 20 sessions to see a difference. "People learn to look at things more objectively. You've been to 20 doctors and they all say nothing is wrong, so what does that suggest?"

  • Learn About Your Condition

    What is hypochondria? Why do you have it? Education is empowering -- and can motivate you to stick to a treatment plan. Understanding the condition often helps ease sufferers' worries. <strong>More from U.S. News:</strong> <a href="http://health.usnews.com/health-news/articles/2012/05/02/are-you-sitting-yourself-to-death" target="_hplink">Are You Sitting Yourself to Death?</a> <a href="http://health.usnews.com/health-news/articles/2012/04/27/can-your-mental-health-affect-your-longevity" target="_hplink">Can Your Mental Health Affect Your Longevity?</a> <a href="http://health.usnews.com/health-news/articles/2012/04/20/your-guide-to-exercising-through-the-ages" target="_hplink">Your Guide to Exercising Through the Ages</a> <em>Flickr photo by <a href="http://www.flickr.com/photos/pedrosimoes7/5442705616/" target="_hplink">pedrosimoes7</a></em>

  • Related Video

For more on personal health, click here.