A CVA, or cerebrovascular accident, is the medical term for what most people call a stroke. It happens when blood flow to part of the brain is suddenly cut off or when a blood vessel in the brain bursts, depriving brain cells of oxygen. Without oxygen, brain cells begin dying within minutes, which is why strokes are treated as medical emergencies. CVA is the term you’ll see on hospital charts, discharge papers, and insurance documents, but it describes the same condition.
How a Stroke Happens
Your brain depends on a constant supply of oxygen-rich blood to function. Even though it makes up only about 2% of your body weight, the brain uses roughly 20% of your body’s oxygen. When a blood vessel feeding the brain gets blocked or ruptures, the area it supplies starts to shut down. The specific symptoms depend entirely on which part of the brain loses its blood supply.
Brain cells are unusually fragile compared to other cells in your body. Most can survive only a few minutes without oxygen before they begin to die permanently. This is why the phrase “time is brain” is used in emergency medicine. Every minute a stroke goes untreated, an estimated 1.9 million neurons are lost. The faster blood flow is restored, the more brain tissue can be saved.
Types of CVA
There are two main categories of stroke, and they require very different treatments.
Ischemic Stroke
About 87% of all strokes are ischemic, meaning a blood clot blocks an artery supplying the brain. The clot can form directly in a brain artery (thrombotic stroke) or travel from somewhere else in the body, often the heart, and lodge in a brain artery (embolic stroke). People with irregular heart rhythms, particularly atrial fibrillation, have a significantly higher risk of embolic strokes because blood can pool and clot in the heart before traveling to the brain.
Hemorrhagic Stroke
The remaining 13% of strokes are hemorrhagic, caused by a blood vessel that ruptures and bleeds into or around the brain. High blood pressure is the most common cause, as it weakens artery walls over time. Aneurysms (weak spots that balloon out on a blood vessel) and abnormal tangles of blood vessels can also rupture. Hemorrhagic strokes are less common but tend to be more deadly, accounting for about 40% of all stroke deaths.
Recognizing Stroke Symptoms
Stroke symptoms appear suddenly, not gradually over hours or days. The most widely taught method for spotting them is the FAST acronym:
- Face drooping: One side of the face sags or feels numb. If you ask the person to smile, the smile looks uneven.
- Arm weakness: One arm drifts downward when both are raised. Numbness or weakness on one side of the body is a hallmark sign.
- Speech difficulty: Words come out slurred, jumbled, or not at all. The person may struggle to repeat a simple sentence.
- Time to call emergency services: If any of these signs appear, even briefly, call for emergency help immediately.
Other symptoms that don’t fit neatly into FAST include sudden severe headache with no known cause, sudden confusion, trouble seeing in one or both eyes, and sudden difficulty walking or loss of coordination. Women sometimes experience additional symptoms like sudden nausea, general weakness, or shortness of breath.
Transient Ischemic Attack (TIA)
A TIA, sometimes called a “mini-stroke,” produces the same symptoms as a full stroke but resolves on its own, usually within minutes to an hour. It happens when a clot temporarily blocks blood flow but dissolves before permanent damage occurs. A TIA is not harmless. About 1 in 3 people who experience a TIA will eventually have a full stroke, and roughly 10-15% will have a stroke within 90 days. A TIA is best understood as an urgent warning that the conditions for a major stroke already exist.
Major Risk Factors
High blood pressure is the single largest risk factor for stroke, contributing to roughly half of all strokes worldwide. It damages artery walls, promotes clot formation, and increases the chance of vessel rupture. Other significant risk factors include diabetes, high cholesterol, smoking, obesity, and physical inactivity. Atrial fibrillation increases stroke risk about fivefold.
Age plays a major role. The risk of stroke roughly doubles every decade after age 55. However, strokes are not limited to older adults. About 10-15% of strokes occur in people aged 18 to 50, and rates in younger adults have been rising in recent decades, likely driven by increasing rates of obesity, diabetes, and high blood pressure in younger populations. Family history of stroke, being Black or Hispanic, and having had a prior stroke or TIA also raise risk substantially.
What Treatment Looks Like
Treatment depends on the type of stroke, which is why brain imaging (typically a CT scan) is the first thing done in the emergency room. For ischemic strokes, the primary goal is to dissolve or remove the clot as quickly as possible. A clot-dissolving medication can be given through an IV, but it works best when administered within 4.5 hours of symptom onset. For large clots blocking major arteries, a procedure called a thrombectomy can physically retrieve the clot, and this can be effective up to 24 hours after symptoms begin in some patients.
Hemorrhagic strokes require the opposite approach: stopping the bleeding and reducing pressure building up inside the skull. This sometimes involves surgery. Blood pressure is carefully controlled to prevent further bleeding.
In both cases, treatment in the first few hours has an outsized impact on outcomes. People treated quickly are significantly more likely to recover with minimal disability. This is why recognizing symptoms and getting to a hospital fast matters more than almost anything else.
Recovery and Long-Term Effects
Stroke effects vary enormously depending on which part of the brain was damaged and how much tissue was lost. Common lasting effects include weakness or paralysis on one side of the body, difficulty speaking or understanding language, memory problems, vision changes, and emotional changes like depression or anxiety. About one-third of stroke survivors experience significant long-term disability.
Recovery is most rapid in the first three months, when the brain is most actively rewiring itself. Physical therapy, speech therapy, and occupational therapy are the cornerstones of rehabilitation. The brain has a real ability to compensate for damage, with healthy areas sometimes taking over functions lost in the stroke, a process called neuroplasticity. Meaningful improvement can continue for months or even years, though progress generally slows over time.
Depression affects roughly one-third of stroke survivors and can significantly slow recovery if untreated. Fatigue is another common issue that many survivors don’t expect, often persisting well beyond the initial recovery period. About 25% of stroke survivors will have another stroke within five years, which is why managing blood pressure, cholesterol, and other risk factors after a first stroke is critical for prevention.