Know Your Risk Before It Strikes
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A stroke happens when blood flow to part of the brain is blocked or when a blood vessel in the brain bursts. Brain cells begin to die within minutes. That is why a stroke is always a medical emergency, no matter the type.
There are 2 main types of stroke. Other terms like TIA, cryptogenic stroke, and brainstem stroke can make the topic feel more complicated than it really is. This article explains each type in plain language so you can understand the differences and why they matter.
What Is a Stroke?
A stroke is also called a cerebrovascular accident (CVA). It happens when blood flow to part of the brain is cut off. The brain depends on oxygen-rich blood to function. When that supply is interrupted, brain cells stop working quickly and can die permanently.
A stroke requires emergency care. How quickly a person receives treatment directly affects the outcome. The type of stroke determines which treatment is used. That is why an accurate stroke diagnosis matters from the very first minute. According to the CDC, stroke is a leading cause of death and long-term disability in the United States.
The 2 Main Types of Stroke
Every stroke falls into one of two main categories. The difference comes down to what caused the blood supply to the brain to fail.
- Ischemic stroke: caused by a blocked artery or blood clot that stops blood flow to the brain
- Hemorrhagic stroke: caused by a blood vessel that ruptures and bleeds into or around the brain
Ischemic strokes account for about 85 to 87% of all strokes. Hemorrhagic strokes account for the remaining 13 to 15%. Many sources also list TIA separately because of how important it is as a warning event. That is covered in its own section below.
Ischemic Stroke: The Most Common Type
An ischemic stroke happens when a blood vessel supplying the brain becomes blocked. Brain tissue quickly loses oxygen and nutrients. Without treatment, brain damage can be severe and permanent. Ischemic stroke is the most common stroke type by far, and it has two main subtypes based on how the blockage forms.
Thrombotic Stroke
A thrombotic stroke occurs when a clot forms directly inside a brain artery. This is closely linked to atherosclerosis, which is a buildup of plaque inside artery walls. It is also associated with diabetes and high cholesterol. The clot may develop gradually or appear suddenly. A smaller version called a lacunar infarct happens when a tiny artery deep in the brain becomes blocked.
Embolic Stroke
An embolic stroke happens when a clot or piece of debris forms somewhere else in the body and travels to the brain. It often begins without warning. Atrial fibrillation is one of the most common causes because it allows blood to pool and clot inside the heart. That clot can then break free and block a brain artery. Learn more about atrial fibrillation and stroke risk.
Hemorrhagic Stroke: Bleeding in or Around the Brain
A hemorrhagic stroke happens when a blood vessel ruptures or leaks. Bleeding damages brain tissue directly and increases pressure inside the skull. Uncontrolled high blood pressure is the most common cause. Other causes include a brain aneurysm, an arteriovenous malformation (AVM), and head trauma. There are two main subtypes.
Intracerebral Hemorrhage
Intracerebral hemorrhage means bleeding inside the brain tissue itself. It is strongly linked to chronic high blood pressure. The onset is often sudden and symptoms can be severe from the start. This is a life-threatening event that requires immediate emergency care.
Subarachnoid Hemorrhage
Subarachnoid hemorrhage involves bleeding in the space between the brain and the thin tissue that covers it. It is often linked to a ruptured aneurysm or an AVM. A sudden, very severe headache is the most recognized symptom. People often describe it as the worst headache of their life.
Transient Ischemic Attack (TIA): The Warning Stroke
A TIA is still a medical emergency. Do not wait for symptoms to go away before calling for help.
A transient ischemic attack (TIA) is often called a mini stroke. The symptoms look and feel exactly like a stroke. The difference is that the blockage is temporary and blood flow returns on its own. TIA symptoms usually resolve within a few minutes to a few hours. In most cases, there is no permanent brain damage.
The word “transient” does not mean safe. A TIA is a serious warning that a full stroke may follow soon. According to the American Stroke Association, up to 15% of strokes are preceded by a TIA. Anyone who experiences TIA symptoms must get to an emergency room immediately, even if the symptoms have already passed.
Other Stroke Types and Classifications
Some stroke labels describe the cause, some describe the location, and some describe the situation. They are not separate main types. They are ways of classifying a stroke more precisely.
Cryptogenic Stroke
A cryptogenic stroke is a confirmed stroke with no identified cause. Even after a full medical evaluation, doctors cannot pinpoint where the clot came from or what triggered the bleed. It accounts for roughly 25 to 30% of ischemic strokes. Research is ongoing to find better ways to identify the underlying cause in these cases.
Brainstem Stroke
A brainstem stroke refers to where the stroke happens in the brain, not what type it is. The brainstem controls breathing, heart rate, swallowing, and coordination. A stroke in this region can be especially serious because it can affect vital body functions. Symptoms may include double vision, difficulty swallowing, and loss of coordination.
Recurrent Stroke
A recurrent stroke is not a separate type. It simply means a person has experienced more than one stroke. Survivors of a first stroke face a higher risk of having another one. Managing risk factors aggressively after a stroke is critical. Read about post-event recovery at Baledoneen.
What Are the 4 Types of Strokes?
Different sources list different numbers of stroke types, which confuses many readers. Here is why: some sources list 2 main categories, some list 3 by adding TIA, and some list 4 by adding cryptogenic stroke or brainstem stroke.
When sources refer to 4 types, they typically mean:
- Ischemic stroke
- Hemorrhagic stroke
- Transient ischemic attack (TIA)
- Cryptogenic stroke or brainstem stroke, depending on the source
Medically, there are 2 main categories: ischemic and hemorrhagic. TIA is often included because of its clinical importance as a warning event. Cryptogenic and brainstem stroke describe cause and location, not separate categories.
Quick Comparison of Stroke Types
| Stroke Type | Main Cause | Key Feature |
| Ischemic stroke | Blocked artery or blood clot | Reduced blood flow to brain |
| Hemorrhagic stroke | Bleeding from ruptured vessel | Pressure and brain bleeding |
| TIA (mini stroke) | Temporary blockage | Stroke-like symptoms that resolve |
| Cryptogenic stroke | Unknown cause | Stroke confirmed, cause unclear |
| Brainstem stroke | Ischemic or hemorrhagic in brainstem | Can affect vital body functions |
Stroke Symptoms: Signs to Watch For
Stroke symptoms often look the same regardless of the type. Time is critical. If you see any of these signs, call emergency services right away.
- Weakness or numbness on one side of the body or face
- Trouble speaking or understanding speech
- Sudden vision problems in one or both eyes
- Dizziness, loss of balance, or trouble walking
- Severe sudden headache with no known cause
- Facial drooping on one side
Act F.A.S.T.
F Face: Is one side of the face drooping?
A Arm: Can both arms be raised, or does one drift down?
S Speech: Is speech slurred or hard to understand?
T Time: Call emergency services immediately. Do not wait.
Why Stroke Type Matters for Diagnosis and Treatment
Treating a stroke correctly depends entirely on knowing which type it is. An ischemic stroke is treated with clot-dissolving medication. A hemorrhagic stroke is treated very differently because clot-busting drugs would make the bleeding worse.
Brain imaging, usually a CT scan or MRI, is the first step in every stroke evaluation. It confirms whether the stroke is ischemic or hemorrhagic. Treatment decisions are made based on those results. This is why getting to a hospital quickly is so important.
Reducing your stroke risk before a stroke happens is just as important. Managing high blood pressure, treating atrial fibrillation, and addressing insulin resistance are three of the most effective ways to lower stroke risk.
Know Your Stroke Risk Before a Stroke Happens
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Frequently Asked Questions
What are the main types of stroke?
There are 2 main types: ischemic stroke, caused by a blocked artery, and hemorrhagic stroke, caused by a burst blood vessel. TIA is often discussed alongside them because it is a major warning event.
What is the difference between ischemic and hemorrhagic stroke?
An ischemic stroke is caused by a clot or blockage that stops blood from reaching part of the brain. A hemorrhagic stroke is caused by a blood vessel that ruptures and bleeds into or around the brain.
What is a transient ischemic attack (TIA)?
A TIA is often called a mini stroke. It causes stroke-like symptoms that resolve on their own because the blockage is temporary. It is still a medical emergency and a strong warning that a full stroke may follow.
What causes an ischemic stroke?
Ischemic strokes are caused by a blood clot or plaque buildup that blocks an artery supplying the brain. Common risk factors include high blood pressure, atrial fibrillation, high cholesterol, diabetes, and smoking.
What causes a hemorrhagic stroke?
Hemorrhagic strokes are most commonly caused by uncontrolled high blood pressure that weakens blood vessel walls. Other causes include a brain aneurysm, an AVM, and head trauma.
What are the early symptoms of a stroke?
Early symptoms include sudden numbness or weakness on one side of the body, trouble speaking, sudden vision problems, dizziness, and a severe sudden headache. Use the FAST test to check for facial drooping, arm weakness, and speech difficulty.
How many types of stroke are there?
Medically, there are 2 main types: ischemic and hemorrhagic. TIA is often listed as a third type because of its clinical importance. The number varies by source depending on whether subtypes and location-based labels are included.
What is the mildest type of stroke?
A TIA is often considered the least damaging because symptoms resolve and there is usually no permanent brain injury. It is still a medical emergency and should never be ignored.
What are the 4 types of strokes?
When sources refer to 4 types, they typically mean ischemic stroke, hemorrhagic stroke, TIA, and cryptogenic stroke or brainstem stroke. Medically, the 2 main categories are ischemic and hemorrhagic. The others describe cause, subtype, or location.
Medical Disclaimer: This article is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. If you think you or someone else is having a stroke, call emergency services immediately.
Key Sources
About the Author: Christine Cooper
