Are you a woman? You should know that research has found that heart attack symptoms in women are significantly different than symptoms in men. In fact, a study by the National Institute of Health found that less than 30 percent of women who have suffered heart attacks felt chest pain before their attack, and 43 percent said that they had no pain during any stage of the attack.No Pain. Now what?If the number one heart attack symptom that people are told to look out for, crushing pain in the chest, isn't felt by nearly half of women with heart attacks, what symptoms should you be on the watch for?According to the NIH study, the most common early warning heart attack symptoms in women are:Unusual fatigue, reported by over 70 percentsleep disturbance, reported by nearly 50 percentShortness of breath, reported by over 40 percentIt may be a little disconcerting to hear that such common, run-of-the-mill symptoms could actually be indicating a heart attack in process. After all, what woman hasn't had a sleepless night or felt completely exhausted from time to time?Other warning signs commonly experienced by women include indigestion, anxiety and weakness in the arms. Again, common everyday symptoms that may signify a serious, potentially fatal condition.During an AttackDuring the actual heart attack, women in the study reported the following symptoms most frequently:Shortness of breath, or difficulty breathingWeaknessUnusual level of fatigueCold sweatDizzinessMany women felt the warning signs for up to a month before actually experiencing a heart attack. If you have been feeling more worn out than usual, have difficulty catching your breath or have been tossing and turning at night, it's worth being checked out by your doctor. If the doctor dismisses your concerns and refuses to check out your heart, get a second opinion -- and consider finding another doctor!While the symptoms women often experience during a heart attack mimic an anxiety or panic attack, take them seriously. Don't let embarrassment keep you from calling 911 or going to the emergency room. It's not worth it to be the woman who died of embarrassment.