Some people exercise, eat well, and don't smoke, yet still have a heart attack. It feels unfair, and it leaves many asking: what is the reason for a heart attack when the usual warning flags are missing? A person can look healthy and still have problems inside their arteries that no one has checked.

What Happens in a Heart Attack

A heart attack happens when part of the heart muscle doesn't get enough blood. The CDC says the most common reason is a build-up of fat and cholesterol inside the arteries that feed the heart. A less common reason is a sudden, severe spasm that tightens an artery and cuts off blood.

Causes in People Who Seem Healthy

Cholesterol that runs in families: Some people inherit very high "bad" cholesterol from a young age. The CDC estimates about 1 in 311 people worldwide have it, and many don't know without a blood test.
Family history: A close relative with early heart disease raises your risk. Doctors usually mean before age 55 for male relatives and before age 65 for female relatives. Tell your doctor if this applies to you.
Problems you can't feel: High blood pressure, high bad cholesterol, and type 2 diabetes are leading preventable risk factors for heart disease. A slim, active person can have any of them without knowing.
A tear in a heart artery: Doctors call this SCAD. A tear in the artery wall can block blood flow to the heart. It causes an estimated 1 to 4 in every 100 heart attacks, but it is more common in women and is the most common cause during pregnancy and after childbirth. It often affects people with few or no usual risk factors.
Tobacco and polluted air: The American Heart Association links nicotine products like cigarettes to about a third of heart disease deaths. It also says the evidence points to tiny particles in polluted air causing heart problems and deaths.

Early Warning Signs

The early warning signs of a heart attack are not always dramatic. The American Heart Association says most heart attacks start slowly with mild pain or discomfort. Watch for:

Pressure, squeezing, or pain in the middle of the chest, lasting more than a few minutes or coming and going
Discomfort in one or both arms, the back, neck, jaw or stomach
Trouble breathing, with or without chest discomfort
Cold sweat, nausea, or lightheadedness

Chest discomfort is the most common sign in both men and women. Women are somewhat more likely to also have shortness of breath, nausea, or back or jaw pain. If you notice any of these, call your local emergency number right away (112 in India).

How to Prevent Heart Attack

Knowing how to prevent a heart attack starts with knowing your numbers. Regular checks of blood pressure, cholesterol, and blood sugar can find problems you can't feel. The American Heart Association's Life's Essential 8 is a simple guide: eat better, move more, quit tobacco, sleep well, manage your weight, and keep cholesterol, blood sugar, and blood pressure in a healthy range. Most adults need 7 to 9 hours of sleep, since poor sleep is linked with higher blood pressure, blood sugar, and cholesterol.

What Are The Causes of Heart Attack in Healthy People?

Fit and Healthy people who are regular with their gym, exercise, and strict with their diet still encounter a heart attack.