How Coffee and Everyday Actions Raise Stroke Risk

Most people don’t expect a simple morning coffee or a sneeze to be life-threatening—but for some, these everyday actions can trigger a catastrophic brain event. A Dutch study reveals how routine behaviors, often harmless-seeming, sharply increase the risk of a specific, deadly type of stroke.

The key finding: Eight common activities—including drinking coffee—can cause sudden blood pressure spikes that lead to subarachnoid hemorrhage (SAH), a fatal stroke type. Over half of SAH patients die, often within a month.

What Is Subarachnoid Hemorrhage?

Subarachnoid hemorrhage is a stroke caused by the rupture of blood vessels on the brain’s surface, leading to bleeding into the space around the brain. This type of stroke is particularly deadly: 10–15% of victims die before reaching the hospital, and about 50% pass away within a month of the event. It’s a sudden, often unexpected catastrophe with devastating outcomes.

The 8 Everyday Triggers Identified

Researchers at Utrecht University Medical Center in the Netherlands studied patients who had suffered SAH. They asked detailed questions about activities and emotional states in the hour before the stroke: Had the patient drunk a soda (like cola)? Exercised? Had sex? Sneezed or blown their nose? Been startled or angry? They also noted whether these actions were regular habits or one-off occurrences. The goal: to pinpoint which everyday actions significantly raise blood pressure and, consequently, SAH risk.

The study identified eight such triggers:

• Drinking coffee
• Having sex
• Becoming angry
• Sneezing or blowing your nose
• Going to the toilet
• Drinking a can of cola
• Jumping
• Other sudden physical or emotional stressors

Each of these activities, especially when performed infrequently or with intensity, can cause a rapid rise in blood pressure—enough to rupture vulnerable brain blood vessels.

Why These Actions Are Dangerous

The common thread among these triggers is their ability to cause a sudden, sharp increase in blood pressure. For individuals with weak or predisposed brain blood vessels, this spike can be the tipping point that leads to a rupture. The brain’s surface arteries are delicate, and when blood pressure surges unexpectedly, the risk of a hemorrhage increases dramatically. This is why even mundane activities, when done in a way that spikes blood pressure, can have fatal consequences.

While these actions are typically safe for most people, they can become high-risk for those with underlying vascular vulnerabilities. The key takeaway is that sudden blood pressure changes—whether from physical exertion, emotional stress, or even routine habits—can be dangerous.

Frequently Asked Questions

Can drinking coffee really cause a stroke?

Drinking coffee can trigger a sudden blood pressure spike, which may lead to subarachnoid hemorrhage (SAH) in individuals with vulnerable brain blood vessels. While coffee isn’t inherently dangerous for everyone, it’s one of eight everyday activities identified by Dutch researchers that can significantly raise stroke risk in susceptible people.

What is subarachnoid hemorrhage, and why is it so deadly?

Subarachnoid hemorrhage is a type of stroke caused by bleeding into the space around the brain due to ruptured blood vessels. It’s deadly because 10–15% of patients die before reaching the hospital, and about 50% die within a month of the event.

Are sneezing or blowing your nose really stroke risks?

Yes. Sudden actions like sneezing or blowing your nose can cause brief but sharp blood pressure increases, potentially rupturing weak brain blood vessels. Dutch scientists included these in their list of eight everyday activities that raise SAH risk.

How does anger or sex increase stroke risk?

Both anger and sexual activity can cause sudden blood pressure spikes. For people with predisposed or weakened brain blood vessels, these spikes can lead to a subarachnoid hemorrhage, making them risk factors identified in the Dutch study.

Why do some people have higher risks from these activities?

Individuals with undiagnosed or weak brain blood vessels are more susceptible. While these activities are usually safe, they can trigger fatal strokes in people whose vascular system can’t handle sudden blood pressure changes.

How common is subarachnoid hemorrhage?

In the UK, around 8,000 people experience SAH annually, with middle-aged individuals—especially women—more prone to it. It’s a relatively rare but highly lethal form of stroke.

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