Some health risks are obvious. The harder ones to spot are invisible at first — and they can quietly lead to serious illness.
So, what unseen causes can trigger heart problems?
1. Air Pollution
Living in an area with high levels of air pollution significantly raises the risk of developing cardiovascular disease, says Ayaz Sultan, a consultant cardiologist at the British clinic Pall Mall Medical.
He says air pollutants damage blood vessels, making them narrower and stiffer. That restricts blood flow, can trigger abnormal heart rhythms, and may even change the structure of the heart.
Sultan advises avoiding prolonged exposure to polluted air, especially indoors where cigarette smoke accumulates and when spending time near busy roads.
2. High Cholesterol Levels
High cholesterol is a major cause of cardiovascular disease. When cholesterol levels are abnormally high, fatty deposits can build up in blood vessels, reducing blood flow and increasing the risk of clots.
Typically, high cholesterol doesn’t cause symptoms, says Jules Payne, CEO of the charity Heart UK. The only way to know your levels is to get a cholesterol test.
High cholesterol is worsened by diets high in saturated fat and alcohol, smoking, and a lack of physical activity.
Keeping cholesterol in a healthy range is especially important for anyone who has already had a heart attack or stroke. Researchers indicate that about half of people who’ve already experienced such an event may suffer another within the next 114 days.
3. High Blood Pressure
High blood pressure rarely shows symptoms, but it is one of the leading causes of stroke and heart attack.
As with cholesterol and other risk factors, lifestyle changes can help reduce risk. Doctors recommend that everyone over 40 monitor their blood pressure regularly.
4. Gut Microbiome
The idea that the gut microbiome — the trillions of microorganisms living in the intestines — affects cardiovascular health is not new. Scientists are still exploring how microbiome diversity relates to heart disease risk, says dietitian and nutritionist Sarah Schenker.
Researchers have gathered evidence that certain bacteria influence heart health through compounds produced when gut microbes break down specific foods. Those compounds can raise cholesterol, damage blood vessels, and contribute to cardiovascular disease.
Changing your diet can help. Eat plenty of fiber and a variety of vegetables, whole grains, beans, and legumes.
Some studies show that probiotics produced during fermentation may help restore a healthy balance of gut bacteria and slightly lower blood pressure and cholesterol.
5. Hormonal Changes in Women
Hormonal shifts are another major driver of cardiovascular disease in women.
Estrogen, produced naturally by the female body for much of life, offers some protection against heart disease. But menopause causes estrogen levels to fall dramatically, explains cardiovascular disease expert Mikaela Nuttall.
During and after menopause, cholesterol often rises, blood pressure can increase, and body fat distribution changes. That means many of the key risk factors for heart disease become more common.
To support heart health during menopause, choose heart-healthy foods like vegetables and whole grains and keep up regular physical activity.
6. Loneliness
In 2018, researchers at the Cardiology Center at Copenhagen University Hospital analyzed data from thousands of patients with heart problems and found that people who felt lonely developed heart disease more often. That group also had a higher mortality rate.
While experts don’t fully understand why loneliness harms the heart, it is now widely recognized as a contributing risk factor for cardiovascular disease.
