Not a type of pain that strikes only homeless people, but a heavy ache that comes on suddenly and then goes away just as quickly. Otherwise, you feel fine.
The condition: It could be indigestion. Or it could be a heart attack. "Even if it's very short in duration, it can be a sign of something serious," says John Stamatos, M.D., medical director of North Shore Pain Services in Long Island and author of Painbuster.
Here's how serious: A blood clot may have lodged in a narrowed section of a coronary artery, completely cutting off the flow of blood to one section of your heart.
How much wait-and-see time do you have? Really, none. Fifty percent of deaths from heart attacks occur within 3 to 4 hours of the first symptoms. You're literally living on borrowed time.
The diagnostics: A blood test checks for markers of damaged heart tissue. Treatment: angioplasty or bypass.