Scientists discover how stress causes heart attacks and strokes
Surplus white blood cells are linked to plaques in the arteries

A new study by researchers at Harvard Medical School has shed light on why stresses associated with modern life could be a contributing factor to heart attacks, angina and strokes.
Stress has long been associated with a range of health problems, but the study is the first to demonstrate a link between stress responses in the brain and an increased risk of cardiovascular disease in humans.
US scientists studied the brain, bone marrow, spleen and arteries of nearly 300 volunteers and monitored them for four years to see whether they developed signs of heart disease.
Subscribe to The Week
Escape your echo chamber. Get the facts behind the news, plus analysis from multiple perspectives.

Sign up for The Week's Free Newsletters
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
From our morning news briefing to a weekly Good News Newsletter, get the best of The Week delivered directly to your inbox.
The results, published in The Lancet, indicate that "people who have heightened activity in a part of the brain linked to stress – the amygdala – are more likely to develop cardiovascular disease", says the Daily Telegraph.
Over the four-year study, 22 patients had cardiovascular 'events' including heart attack, angina, heart failure, stroke and peripheral arterial disease, The Lancet reports, with a disproportionate number of these patients exhibiting higher than average activity in the amygdala.
The amygdala controls the volume of white blood cells produced by the body's bone marrow, speeding up production when more are needed to fight off infections or speed up recovery from an injury.
High levels of stress trigger the amygdala to raise white blood cell production in anticipation of imminent danger or harm.
Chronic ongoing stress, such as that linked to a busy, high-pressure lifestyle, could therefore lead to a build-up of surplus white blood cells, which in turn can combine with cholesterol, calcium and fat to form the plaques in the arteries associated with heart disease.
Lead author Dr Ahmed Tawako told the BBC that more research was needed to confirm the connection, but that the study "raises the possibility" that reducing stress could produce physical benefits "beyond an improved sense of psychological wellbeing".
He added: "Eventually, chronic stress could be treated as an important risk factor for cardiovascular disease, which is routinely screened for and effectively managed like other major cardiovascular disease risk factors."
Sign up for Today's Best Articles in your inbox
A free daily email with the biggest news stories of the day – and the best features from TheWeek.com
-
What happens if tensions between India and Pakistan boil over?
TODAY'S BIG QUESTION As the two nuclear-armed neighbors rattle their sabers in the wake of a terrorist attack on the contested Kashmir region, experts worry that the worst might be yet to come
-
Why Russia removed the Taliban's terrorist designation
The Explainer Russia had designated the Taliban as a terrorist group over 20 years ago
-
Inside the Israel-Turkey geopolitical dance across Syria
THE EXPLAINER As Syria struggles in the wake of the Assad regime's collapse, its neighbors are carefully coordinating to avoid potential military confrontations
-
'Like a sound from hell': Serbia and sonic weapons
The Explainer Half a million people sign petition alleging Serbian police used an illegal 'sound cannon' to disrupt anti-government protests
-
The arrest of the Philippines' former president leaves the country's drug war in disarray
In the Spotlight Rodrigo Duterte was arrested by the ICC earlier this month
-
Ukrainian election: who could replace Zelenskyy?
The Explainer Donald Trump's 'dictator' jibe raises pressure on Ukraine to the polls while the country is under martial law
-
Why Serbian protesters set off smoke bombs in parliament
THE EXPLAINER Ongoing anti-corruption protests erupted into full view this week as Serbian protesters threw the country's legislature into chaos
-
Who is the Hat Man? 'Shadow people' and sleep paralysis
In Depth 'Sleep demons' have plagued our dreams throughout the centuries, but the explanation could be medical