Left side Stroke



A left brain stroke happens when blood supply to the left side of the brain is stopped. The left side of the brain is in charge of the right side of the body. It also controls the ability to speak and use language.

There are two main types of stroke: ischemic and hemorrhagic . An ischemic stroke is the most common type.

Medical care is needed right away. Cells in the brain die if they are without oxygen for more than a few minutes. This can be deadly.

Copyright © Nucleus Medical Media, Inc.


An ischemic stroke happens when blood flow is blocked. This may be caused by:

  • A clot from another part of the body that breaks off and becomes trapped in a blood vessel supplying the brain
  • A clot that forms in an artery that supplies blood to the brain
  • A tear in an artery supplying blood to the brain

A hemorrhagic stroke is caused by a burst blood vessel. Blood pools in the brain. This slows or stops the flow of blood and causes a buildup of pressure on the brain.

Hemorrhagic vs. Ischemic Stroke
factsheet image
Copyright © Nucleus Medical Media, Inc.

Risk Factors

This problem is more common in older adults and people with a family history of stroke.

Problems that affect blood vessel health and blood flow can raise the risk of stroke. Some examples are:

  • History of transient ischemic attacks (TIA)
  • Lack of physical activity
  • Smoking
  • Alcohol use disorder
  • Obesity or metabolic syndrome
  • Type 2 diabetes or prediabetes
  • High blood pressure
  • High cholesterol
  • Heart diseases or injury such as previous heart attack, atrial fibrillation or enlarged heart
  • Diseases of blood vessels such as carotid artery stenosis or atherosclerosis

Daily habits can also play a role. Some examples are:

  • Smoking
  • A diet that is high in saturated fat, trans fat, cholesterol, and sodium
  • Physical inactivity
  • Drug abuse from cocaine , amphetamines, or heroin use



Symptoms occur suddenly and may include:

  • Muscle weakness on the right side of the body
  • Problems saying what you mean to say or understanding speech
  • Vision problems, including problems seeing from the right side of each eye
  • Sensory changes on the right side of the body
  • Problems with depth perception or directions
  • Problems with balance
  • Memory problems
  • Difficulty understanding, problem solving, and making decisions
  • Problems chewing, swallowing, and speaking


A stroke needs to be diagnosed quickly. The doctor will ask you or a family member about your symptoms and health history. A physical exam will be done. The doctor will look for signs of nerve or brain problems.

Blood tests may be done to look for clotting problems.

Images may be taken of the brain. This can be done with:

  • CT scan
  • Angiogram —to look at the heart and its blood supply
  • CT angiogram
  • MRI scan
  • Magnetic resonance angiography (MRA)
  • Doppler ultrasound

Heart function will be checked. This can be done with:

  • Electrocardiogram (ECG) to look at the heart's electrical activity
  • Echocardiogram to look at the heart's muscle movements



Emergency care will be needed. The heart and lungs may need support. A tube may also be placed to help with breathing. Other options are:


For an ischemic stroke, medicine may be given to:

  • Dissolve clots and prevent new ones from forming
  • Thin blood

For a hemorrhagic stroke, medicine may be given to:

  • Work against any blood-thinning drugs a person has been taking
  • Reduce how the brain reacts to bleeding


Options to treat an ischemic stroke are:

  • Embolectomy—a tube is passed through blood to remove a clot or deliver medicine to break it up
  • Vertebrobasilar angioplasty and stenting —a major artery to the brain is widened and a mesh tube is left in place to help keep it open


Therapy may be needed to regain lost skills. Options are:

  • Physical therapy—to improve movement
  • Occupational therapy—to help with daily tasks and self care
  • Speech therapy—to improve swallowing and speech
  • Psychological therapy—to provide support after the stroke


The risk of stroke can be lowered by:

  • Managing chronic health problems, such as high blood pressure and diabetes
  • Maintaining a healthy weight through diet and exercise
  • Eating a diet that is low in fat and cholesterol and rich in whole grains, fruits, and vegetables
  • Not smoking
  • Limiting alcohol

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Edits to original content made by Denver Health.

a (Stroke, Left-side; Left Hemisphere Stroke; Stroke, Left Hemisphere)


American Heart Association http://www.heart.org 

National Stroke Association http://www.stroke.org 


Health Canada https://www.canada.ca 

Heart and Stroke Foundation http://www.heartandstroke.com 


Effects of stroke. Johns Hopkins Medicine website. Available at: https://www.hopkinsmedicine.org/health/conditions-and-diseases/stroke/effects-of-stroke. Accessed January 13, 2021.

Hemorrhagic strokes (bleeds). American Stroke Association website. Available at: https://www.stroke.org/en/about-stroke/types-of-stroke/hemorrhagic-strokes-bleeds. Accessed January 12, 2021.

Intracerebral hemorrhage. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/intracerebral-hemorrhage. Accessed January 12, 2021.

Ischemic strokes (clots). American Stroke Association website. Available at: American Stroke Association website. Available at: https://www.stroke.org/en/about-stroke/types-of-stroke/ischemic-stroke-clots#.Vk3ipE2FPIU. Accessed January 12, 2021.

Long-term management of stroke. EBSCO DynaMed website. Available at: https://www.dynamed.com/management/long-term-management-of-stroke. Accessed January 12, 2021.

Medelson SA, Prabhakaran S. Pace of progress in stroke thrombolysis: are hospitals running to stand still? Circ Cardiovasc Qual Outcomes. 2017;10(1):e003438.

Neuroimaging for acute stroke. EBSCO DynaMed website. Available at: https://www.dynamed.com/evaluation/neuroimaging-for-acute-stroke. Accessed January 12, 2021.

Stroke (acute management). EBSCO DynaMed website. Available at: https://www.dynamed.com/management/stroke-acute-management-1. Accessed January 12, 2021.

Subarachnoid hemorrhage. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/subarachnoid-hemorrhage. Accessed January 12, 2021.

1/18/2017 DynaMed Systematic Literature Surveillance https://www.dynamed.com/prevention/cardiovascular-disease-possible-risk-factors: Emdin CA, Odutayo A, Wet al. Meta-analysis of anxiety as a risk factor for cardiovascular disease. Am J Cardiol. 2016;118(4):511-519.