Stroke: Symptoms, Causes, and Treatment

Stroke happens when blood flow to part of the brain is interrupted, either by a blockage (ischemic stroke) or bleeding (hemorrhagic stroke). Brain cells begin dying within minutes. Recognizing symptoms using the FAST acronym (Face drooping, Arm weakness, Speech difficulty, Time to call emergency services) and getting immediate medical help can save lives and minimize long-term effects.

In plain words

A stroke happens when blood flow to part of the brain stops. This can be because of a blockage or bleeding. When the brain doesn’t get enough blood, brain cells start to die. This can cause lasting brain damage, disability, or death. Knowing the signs of stroke and getting help fast can save lives and reduce harm. The FAST acronym helps you remember the key signs: Face drooping, Arm weakness, Speech trouble, Time to call for help.

What is Stroke: Symptoms, Causes, and Treatment?

Symptoms

Early symptoms

Face drooping: One side of the face may droop or feel numb. When smiling, the face may appear uneven or lopsided. (2) (7)
Arm weakness: Sudden weakness or numbness in one arm. When raising both arms, one may drift downward involuntarily. (2) (7)
Speech difficulty: Slurred speech, trouble finding words, or saying things that don't make sense. May have trouble repeating simple phrases. (2) (7)
Vision problems: Sudden blurred, blackened, or double vision in one or both eyes. May experience vision loss. (2)
Severe headache: Sudden, intense headache with no known cause, often described as 'the worst headache of my life'. (2)
Dizziness or loss of balance: Trouble walking, loss of coordination, or sudden unexplained falls. (2)

Serious or emergency symptoms

Complete paralysis on one side: Inability to move face, arm, and leg on one side of the body (hemiplegia). Call emergency services immediately and note the time symptoms started. (2)
Loss of consciousness: Sudden collapse, blacking out, or unresponsiveness. Call emergency services immediately. Do not wait to see if symptoms improve. (2)

Causes

Primary causes

Ischemic stroke (blocked artery): Most common type (about 87% of strokes). Caused by blood clots or narrowed arteries blocking blood flow to the brain. (1) (8)
Hemorrhagic stroke (bleeding in brain): Occurs when a weakened blood vessel ruptures and bleeds into the brain. Includes intracerebral and subarachnoid hemorrhage. (1)
Transient ischemic attack (TIA): Temporary blockage with stroke-like symptoms that resolve within 24 hours. Often warnings of future stroke. (1)

Risk factors

High blood pressure

The most important controllable risk factor for stroke. Blood pressure consistently over 130/80 mmHg significantly increases risk. (4) (3)

Atrial fibrillation

Irregular heart rhythm that can cause blood clots leading to stroke. Increases stroke risk fivefold. (3)

Diabetes

Chronic high blood sugar damages blood vessels over time, increasing stroke risk. (4) (3)

Smoking

Damages blood vessels and increases clot formation. Stroke risk drops significantly after quitting. (4)

Diagnosis

Emergency diagnosis involves physical exam, review of symptoms, and immediate brain imaging (usually CT scan) to determine stroke type. Additional tests may include MRI, carotid ultrasound, echocardiogram, and blood tests to identify underlying causes. Time from symptom onset is critical for treatment decisions.

CT scan of brain

Quickly identifies bleeding (hemorrhagic stroke) or large blockages (ischemic stroke). First imaging test done in most cases. (5)

MRI of brain

More detailed images of brain tissue. Can detect smaller strokes and subtle changes CT may miss. (5)

Carotid ultrasound

Looks for narrowed arteries or plaques in neck arteries that may have caused the stroke. (5)

Echocardiogram

Checks heart for clots or structural problems that could send clots to the brain. (5)

Treatment

Medication options

Thrombolytics (clot busters)

Dissolves blood clots blocking brain arteries in ischemic stroke. Most effective when given within 4.5 hours of symptom onset. (5) (8)

Antiplatelet drugs

Prevent platelets from clumping together to form new clots. Often started in ischemic stroke patients. (5)

Blood pressure control medications

Carefully managed blood pressure reduces stroke risk and prevents further damage after hemorrhagic stroke. (5)

Lifestyle and self-care

Stroke rehabilitation: Tailored therapy with physical, occupational, and speech therapists to regain lost skills and independence. Early and intensive rehab leads to best outcomes. (6)
Smoking cessation: Quitting smoking significantly reduces stroke risk and improves recovery. Many effective quitting aids are available with medical guidance. (3)
Healthy diet: A diet rich in fruits, vegetables, whole grains and lean proteins while limiting salt, sugar and saturated fats supports stroke recovery and prevention. (3)
Regular physical activity: Supervised exercise improves strength, endurance and cardiovascular health after stroke. Start slow and increase activity as tolerated with medical approval. (6)

Always discuss dosing and treatment changes with your own prescriber.

Possible complications

Movement and coordination problems: Stroke can cause paralysis, weakness, or loss of coordination, often on one side of the body. May require assistive devices or home modifications. (4) (6)
Speech and language difficulties: Aphasia (trouble speaking or understanding speech) affects many stroke survivors. Speech therapy helps improve communication skills. (4) (6)
Cognitive changes: Memory loss, trouble concentrating, and difficulty making decisions may occur after stroke. Cognitive rehab can help maximize function. (4) (6)
Emotional changes: Depression, anxiety, and emotional lability (sudden crying or laughing) are common after stroke and require professional support. (4) (6)

When to see a doctor

Routine follow-up

Regular checkups are important if you have stroke risk factors like high blood pressure, atrial fibrillation, diabetes, or high cholesterol. Your doctor can help manage these conditions to reduce stroke risk. (3)

Seek emergency care

Call emergency services immediately if you notice any sudden signs of stroke - remember FAST: Face drooping, Arm weakness, Speech difficulties, Time to call. Don't wait to see if symptoms improve. (2) (7)
Seek immediate medical attention even if stroke symptoms go away quickly (transient ischemic attack or TIA). TIAs are warning signs requiring urgent evaluation to prevent full stroke. (2) (7)

Frequently asked questions

What is a stroke?

A stroke is a medical emergency where blood flow to part of the brain is interrupted, either by a blockage (ischemic stroke) or bleeding (hemorrhagic stroke). Brain cells begin dying within minutes without oxygen and nutrients from blood. (1)

What are the warning signs of stroke?

Remember FAST: Face drooping, Arm weakness, Speech difficulty, Time to call emergency services. Other signs include sudden vision problems, dizziness, severe headache, or confusion. Never ignore these symptoms. (2) (7)

What causes a stroke?

Ischemic strokes (most common) are caused by blood clots blocking arteries to the brain. Hemorrhagic strokes occur when blood vessels in the brain burst. Risk factors like high blood pressure significantly increase stroke risk. (1)

How is stroke treated?

Treatment depends on stroke type. Ischemic strokes may be treated with clot-busting drugs or clot removal procedures if done quickly. Hemorrhagic strokes may require surgery. Prompt emergency care is critical for best outcomes. (5)

Can you recover from a stroke?

Recovery varies. Many survivors regain significant function with rehabilitation, though some effects may be permanent. Starting rehab early and consistently is key. Preventing another stroke through medical management is also crucial. (6)

References

CDC — About Stroke source 1
CDC — Stroke Signs and Symptoms source 2
CDC — Preventing Stroke source 3
WHO — Stroke Fact Sheet source 4
NHS — Stroke Overview source 5
NHS — Stroke Recovery source 6
American Heart Association — Stroke Symptoms source 7
MedlinePlus — Ischemic Stroke source 8