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Muscle tension

Near-constant muscle tension—whether it consists of clenching your jaw, balling your fists, or flexing muscles throughout your body—often accompanies anxiety disorders. This symptom can be so persistent and pervasive that people who have lived with it for a long time may stop noticing it after a while.

Regular exercise can help keep muscle tension under control, but the tension may flare up if an injury or other unforeseen event disrupts a person's workout habits, Winston says. "Suddenly they're a wreck, because they can't handle their anxiety in that way and now they're incredibly restless and irritable."

Next: Chronic indigestion