context: Have you learned that someone you care about had a stroke? Don't jump to conclusions about how it will affect him. Not all strokes are created equal. There are three major kinds, with different warning signs and symptoms. All types have one thing in common: a loss of blood to part of your brain. That causes big problems. Your brain cells need the oxygen that's carried by your blood. So when a stroke cuts the supply, some of the cells start to die. And that sets off trouble like memory loss, confusion, and numbness on one side your body. There are two main types of stroke: Ischemic Hemorrhagic If you have signs of any of them, call 911 right away. The sooner you get treated, the less likely you are to have long-term effects. Most strokes are this type. You get them when a fatty substance called plaque collects in your arteries and narrows them. This is called atherosclerosis, and it slows the flow of blood. As it pools, blood can clump and form clots -- and your artery gets blocked. Besides atherosclerosis, some other things that can raise your chances of getting an ischemic stroke are: Irregular heartbeat Heart attack Problem with your heart's valves Injury to blood vessels in your neck Blood clotting problem There are two main types of ischemic stroke: Thrombotic strokes. They're caused by a blood clot that forms in an artery that supplies blood to your brain. Embolic strokes. They happen when a clot forms somewhere else in your body and travels through the blood vessels to your brain. It gets stuck there and stops the flow of your blood. The symptoms of an ischemic stroke depend on which parts of your brain are affected. They can include things like: Sudden numbness or weakness of your face, arm, or leg, often on one side of the body Confusion Problems speaking or understanding others Dizziness, loss of balance or coordination, or trouble walking Vision loss or double vision You're more likely to have an ischemic stroke if you: Are over age 60 Have high blood pressure, heart disease, high cholesterol, or diabetes Have an irregular heartbeat Smoke Have a family history of strokes Sometimes you can get complications. A stroke damages your brain cells. The more damage that's done, the more problems you can have. That's why it's important to get medical help as soon as possible. If you don't get treatment, you can have trouble like: Fluid buildup, swelling, and bleeding in your brain Seizures Problems with memory and understanding Ischemic strokes also include something called a "mini stroke" or a TIA (transient ischemic attack). This is a temporary blockage in blood flow to your brain. The symptoms usually last for just a few minutes or may go away in 24 hours. TIAs can happen because the vessels that bring blood to your brain narrow. They also might occur because of a clot. The symptoms may be similar to an ischemic stroke. You might have: Numbness on one side of your body Confusion Dizziness or loss of balance Trouble talking or understanding Problems with your vision Severe headache Things that can raise your chances of getting a TIA are the same as those for other strokes, including: Age High blood pressure, high cholesterol, diabetes, and heart disease Obesity Smoking Family history of strokes A TIA can sometimes be a warning sign that you'll have an ischemic stroke soon. Don't take any chances if you or someone you know has any symptoms that seem like a stroke. Get medical help in a hurry. These happen when there is bleeding in your brain that damages nearby cells. The most common causes are: High blood pressure Injury Bleeding disorders Cocaine use Abnormal blood vessels ( AVMs) Aneurysm (a weak area in a blood vessel that breaks open) Your doctor may tell you about two types of hemorrhagic stroke that are based on where the bleeding happens. If he says you had a "subarachnoid hemorrhage," it means it happened in the area between your brain and skull. But if he says it was an "intracerebral hemorrhage," your bleeding was inside the brain. Hemorrhagic stroke symptoms usually increase gradually over minutes or a few hours, although a subarachnoid hemorrhage may come on suddenly. Some things that can happen: Intense headache that some people describe as "the worst headache they've ever had" Confusion Nausea or throwing up Sensitivity to light Problems with vision Passing out You're more likely to have this type of stroke if you: Are over age 65 Have high cholesterol, high blood pressure, or diabetes that's not under control Are obese Had a stroke in the past Have a family history of strokes Smoke Eat unhealthy foods Don't exercise A hemorrhagic stroke can cause complications like: Seizures Memory and thinking problems Heart problems Swallowing problems and trouble eating and drinking