Is It a Headache or a Stroke?

Sometimes, a terrible headache can indicate a much bigger problem—do you know the signs to look for?

When you get a headache, you might take aspirin and try to shrug it off. But sometimes a headache is a sign of something more serious—like a stroke, a condition that’s similar to a heart attack but affects the brain. 

More than 795,000 Americans have a stroke every year, according to the Centers of Disease Control and Prevention (CDC), and about 140,000 die as a result. One survey found that while 60 percent of people knew that severe headache with no known cause could signal a stroke, only 38 percent of people could recognize all the major symptoms and knew to call 911 right away. 

Unfortunately, determining when your headache spells trouble can be difficult. Here’s what you need to know about the two main types of stroke, as well as why some headaches are more cause for concern than others. 

Pay attention to these symptoms 
About 85 percent of strokes are ischemic. They occur when a blood vessel becomes blocked, hindering blood flow to the brain. Many ischemic strokes don’t cause headaches, but are associated with other telltale symptoms, such as drooping on one side of the face, weakness in an arm or leg or difficulty speaking. 

However, some types of ischemic strokes can produce a splitting headache. These include arterial dissections—tears in the wall of an artery supplying the brain that leads to a blockage—and cerebral venous sinus thrombosis, which is a blockage in veins draining blood from the brain. 

In addition to a severe headache, other signs of this type of stroke include: 

  • Facial pain or numbness on the same side as the headache 
  • Numbness on the opposite side of the body to the headache 

People with headaches due to venous sinus thrombosis may also have blurry vision and seizures. 

Why the worst headache of your life is a red flag 
The remaining 15 percent of strokes are hemorrhagic. These are brain bleeds, and there are two types: an intracerebral hemorrhagic stroke and a subarachnoid hemorrhagic stroke. 

An intracerebral hemorrhagic stroke, which accounts for around 12 percent of all strokes, occurs when a weakened blood vessel or aneurysm bursts, causing a brain bleed. Hypertension is the most common risk factor for an intracerebral hemorrhagic stroke. 

A subarachnoid hemorrhagic stroke occurs when a bulge in a blood vessel—an aneurysm—within the covering layers of the brain ruptures, causing bleeding in the space surrounding the brain. While subarachnoid hemorrhagic strokes are less common, accounting for around 3 percent of all brain attacks, their results are often devastating. Half of all patients die within the first six months, with between 15 and 30 percent of people with a brain bleed dying before even reaching the hospital. 

An intracerebral hemorrhage, which most often occurs in people with high blood pressure, or less frequently, from an underlying blood vessel malformation, causes sudden, severe headaches. People with subarachnoid hemorrhagic strokes often complain of suddenly having the worst headache of their lives. 

How strokes are treated 
Ischemic strokes are usually treated with drugs to dissolve the blood clot. Minimally invasive catheter-based treatments—similar to stents used on heart attack patients—can also open blocked vessels in people with brain attacks. 

While brain surgery was once the only option for hemorrhagic strokes, less-invasive options are now available, including endovascular treatments with coils, stents and flow diverters for brain aneurysms, and endoscopic treatments with vacuum suction devices for draining brain bleeds. 

How to reduce your risk 
Some risk factors for stroke, such as getting older, can’t be changed. Stroke risk doubles with each decade after age 55. Your risk of stroke is greater if you have a family history of the disease, as well. 

Fortunately, there are some things you can do to lower stroke risk, including: 

  • Lose weight 
  • Exercise regularly 
  • Eat a healthy diet 
  • Watch your blood sugar 
  • Lower your cholesterol 
  • Watch your blood pressure 
  • Don’t smoke, and avoid being around second-hand smoke 

Finally, if you think you or someone you know is having a stroke, remember the acronym F.A.S.T. 

  • Facial drooping  
  • Arm weakness 
  • Speech difficulty 
  • Time to call 911 

If any of the first three symptoms are present, get medical help right away. It might be the difference between life and death. 

Medically reviewed in August 2019. Updated in March 2021. 


American Stroke Association. “Stroke Risk Factors,” “Hemorrhagic Stroke,” “Types of Stroke.” 
Centers for Disease Control and Prevention. “Stroke Facts,” “Types of Stroke.” 
Johns Hopkins Medicine Neurology and Neurosurgery. “Intracerebral Hemorrhage,” “Arterial Dissection.” 
Mayo Clinic. “Stroke.” 
NIH/National Heart, Lung and Blood Institute. “Stroke.” 
Medscape. “Vertebral Artery Dissection,” ‘Vertebral Artery Dissection Clinical Presentation,” “Subarachnoid Hemorrhage Surgery .” “Patient education: Ischemic stroke treatment (Beyond the Basics).” 
Weill Cornell Brain and Spine Center. “Intracerebral Hemorrhage." 

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