The signs of a heart attack vary from person to person, and the symptoms can be mistaken for something else. More often than not, the signs of an oncoming heart attack will only be noticed once you have one and look back at them.
A clot getting stuck in a narrowed artery and stopping the blood supply to your heart is the main cause of a heart attack. The only symptoms of heart disease, prior to the formation and loading of a clot, are due to narrow arteries reducing blood supply. So the preliminary indications of a heart attack are the same as the indications of heart disease.
The difficulty presented by heart disease is that it advances slowly, allowing one to grow accustomed to and adapt to the symptoms without the thought that they are warning signs of heart disease or a possible heart attack.
Shortness of breath, chest discomfort and fatigue are the three basic symptoms that become noticeable at first. These symptoms may not all occur at the same time and at the same intervals and will probably not be very strong at first.
Perhaps one day, as you climb the steps, you feel somewhat short of breath and may attribute that to your age, your stress level, your tiredness or another minor reason.
You might even decide that the best treatment would be to exercise, but all too often you forget about this commitment. It will become more normal to feel breathless after some weeks. You will acclimate to it and begin to not notice it anymore. This will be the same for any feeling of tiredness or pain. You usually disregard these symptoms and continue to live with them.
Your blood pressure gives the only dependent indication of any heart disease. The symptoms of high blood pressure and heart disease are the same and so your best tool is a blood pressure monitor to check if you have high blood pressure
You do not need to see a doctor to do it either. According to recent studies, by consistently taking your own blood pressure at home rather than at the doctor's office annually or bianually, your results may be more accurate.
If you do not own a monitor, you should get one soon. If you've got a monitor but are not using it, then now is the time to start!