A heart attack can happen when there is a lack of blood to the heart, usually caused by a blood clot.
The NHS lists the four symptoms to look out for - chest pain, shortness of breath, feeling weak and/or lightheaded, and an overwhelming feeling of anxiety.
Not everyone experiences severe chest pain, but if it happens, the chest can feel like it’s being pressed or squeezed by a heavy object, and pain can radiate from the chest to the jaw, neck, arms and back.
The leading cause of a heart attack is coronary heart disease, a condition where the major blood vessels that supply the heart get clogged up with deposits of cholesterol, known as plaques.
Living a healthy lifestyle can help prevent you from developing coronary heart disease and having a heart attack.
There are six lifestyle factors that can increase your chances of getting coronary heart disease.
These are high blood pressure, high cholesterol, smoking, weight and body shape, diabetes and not doing enough physical activity, according to the British Heart Foundation.
But the main prevention methods to lower your risk of coronary heart disease and having a heart attack are eating a heathy, balanced diet, avoiding smoking and trying to keep your blood pressure at a healthy level.
Foods high in saturated fats include meat pies, sausages and fatty cuts of meat, butter and cakes and biscuits.
But eating a small amount of unsaturated fat will increase the level of good cholesterol and help reduce any blockage in your arteries.
For high blood pressure, a reading can often be reduced by a healthy diet, moderating your intake of alcohol, maintaining a healthy weight and taking regular exercise.
You could also lower your risk of high blood pressure by taking daily vitamin B12 supplements, according to Healthspan’s Head of Nutrition Rob Hobson.
Vitamin B12 supplements could lower blood pressure by preventing a build up of the amino acid homocysteine, said Hobson.
Higher levels of homocysteine has been linked to cardiovascular disease.
The exact cause of the link isn’t entirely understood, however.
Vitamin B12 breaks down the amino acid in the body, and could therefore lower your risk of hypertension.
One of the best ways to supplement the vitamin is by using an oral spray, the nutritionist said.