An aneurysm is a ballooning at a weak spot in an artery wall. An aneurysm's walls can be thin enough to rupture. The illustration shows an individual with an unruptured aneurysm. The inset shows what happens when the aneurysm ruptures. Show
 The Dangers of Brain AneurysmAneurysms can lurk without symptoms, but screening can save lives. Click here for an infographic to learn moreA brain aneurysm (AN-yoo-riz-um) is a bulge or ballooning in a blood vessel in the brain. An aneurysm often looks like a berry hanging on a stem. A brain aneurysm can leak or rupture, causing bleeding into the brain (hemorrhagic stroke). Most often, a ruptured brain aneurysm occurs in the space between the brain and the thin tissues covering the brain. This type of hemorrhagic stroke is called a subarachnoid hemorrhage. A ruptured aneurysm quickly becomes life-threatening and requires prompt medical treatment. Most brain aneurysms, however, don't rupture, create health problems or cause symptoms. Such aneurysms are often detected during tests for other conditions. Treatment for an unruptured brain aneurysm may be appropriate in some cases and may prevent a rupture in the future. Talk with your health care provider to ensure you understand the best options for your specific needs. Products & Services
SymptomsRuptured aneurysmA sudden, severe headache is the key symptom of a ruptured aneurysm. This headache is often described as the "worst headache" ever experienced. In addition to a severe headache, common signs and symptoms of a ruptured aneurysm include:
'Leaking' aneurysmIn some cases, an aneurysm may leak a slight amount of blood. This leaking may cause only a sudden, extremely severe headache. A more severe rupture often follows leaking. Unruptured aneurysmAn unruptured brain aneurysm may produce no symptoms, particularly if it's small. However, a larger unruptured aneurysm may press on brain tissues and nerves, possibly causing:
When to see a doctorSeek immediate medical attention if you develop a:
If you're with someone who complains of a sudden, severe headache or who loses consciousness or has a seizure, call 911 or your local emergency number. Brain aneurysms develop as a result of thinning artery walls. Aneurysms often form at forks or branches in arteries because those areas of the vessels are weaker. Although aneurysms can appear anywhere in the brain, they are most common in arteries at the base of the brain. Mayo Clinic Minute: What is an aneurysm?Show transcript for video Mayo Clinic Minute: What is an aneurysm? An aneurysm is an abnormal bulge or ballooning in the wall of a blood vessel. "A proportion of these patients will go on to have a rupture. And the challenge with rupture is that it's unpredictable." Dr. Bernard Bendok says a ruptured aneurysm is a medical emergency that can cause life-threatening bleeding in the brain. "The typical presentation is somebody who has the worst headache of their life." Fast treatment is essential. It includes open surgery, or less-invasive options, such as sealing the ruptured artery from within the blood vessel with metal coils and/or stents. Dr. Bendok says 1 to 2 percent of the population have aneurysms, and only a small percentage of that group will experience a rupture. People who have a family history of aneurysms, have polycystic kidney disease, connective tissue disease, and people who smoke are at increased risk of rupture, and should consider screening. If a rupture happens, fast treatment can save lives. Request an Appointment at Mayo Clinic There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. Sign up for free, and stay up to date on research advancements, health tips and current health topics, like COVID-19, plus expertise on managing health. Email ErrorEmail field is required ErrorInclude a valid email address To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. |
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