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Cold sweats

Rosie O'Donnell reported feeling "clammy" when she was experiencing her heart attack and, among women, this isn't unusual.

Be wary if you suddenly break out in a cold sweat, especially if you're sure you're not going through menopause. Fortunately, this may be one symptom that actually gets you to the hospital sooner rather than later.

One study of about 1,000 patients found that those who experienced sweating, among other symptoms, were less likely to delay getting to the hospital.

Next: Chest pain and pressure