Cerebral Amyloid Angiopathy: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 23, 2026.
What kind of doctor treats cerebral amyloid angiopathy?
A neurologist (brain and nerve doctor) usually manages cerebral amyloid angiopathy, a condition where a protein builds up in the walls of small blood vessels in the brain, raising the risk of bleeding and memory problems. There is no cure, so care focuses on monitoring and lowering bleeding risk. Call 911 for sudden severe headache, weakness or trouble speaking.
What is cerebral amyloid angiopathy?
Cerebral amyloid angiopathy is often called CAA. In this condition, proteins called amyloid build up on the walls of the arteries in the brain. The protein deposits make the vessel walls weaker over time. CAA can cause bleeding into the brain, which is a type of stroke. It can also cause dementia, which is a loss of memory and thinking skills.
The main risk factor is age. CAA is usually seen in people older than 55. Sometimes it is passed down through families. It is also related to Alzheimer's disease. In both conditions, a protein called amyloid builds up in the brain.
Symptoms
When a CT scan is done, there are often signs of bleeding in the brain that a person may not have realized. Bleeding often happens in the outer parts of the brain, called the cortex. Some people have gradual memory problems instead of a sudden event.
If there is a lot of bleeding, symptoms come on suddenly and resemble a stroke. These can include:
- Drowsiness.
- Headache, usually in one part of the head.
- Sudden nervous system changes, such as confusion, vision changes, speech problems, weakness, or paralysis, which means loss of movement.
- Seizures.
- Vomiting can happen too.
If bleeding is mild, symptoms can include episodes of confusion. Headaches may come and go. Weakness or odd sensations may come and go. Seizures can happen. So can loss of mental function, called dementia.
Causes and who gets it
In CAA, a protein called amyloid builds up in the walls of the brain's blood vessels. The clumps collect in blood vessels rather than between brain cells. This buildup can weaken the vessels and cause bleeding in the brain.
Most cases happen by chance as a person gets older. A rare inherited form runs in families. CAA can cause dementia.
How doctors diagnose it
CAA is hard to diagnose with certainty without a sample of brain tissue. A sample is usually taken only after death or from a biopsy of brain blood vessels. In practice, doctors use brain imaging. A CT scan or MRI scan can check for bleeding in the brain. An MRA scan, an MRI scan of the blood vessels, can check for large bleeds and other causes of bleeding. A PET scan can check for amyloid deposits in the brain.
Treatment
There is no known effective treatment for the protein buildup itself. The goal is to reduce the risk of bleeding by controlling risk factors and to relieve symptoms.
Keeping blood pressure well controlled is very important. High blood pressure raises the risk of bleeding. Doctors usually avoid blood thinners and antiplatelet medicines (medicines that stop clots, such as aspirin) in CAA unless there is a strong reason to use them. Your doctor decides, so never start or stop one on your own. Sometimes, medicines that help improve memory, such as those used for Alzheimer's disease, are used. Seizures may be treated with anti-seizure medicines. Some people need rehabilitation for weakness or clumsiness. This can include physical, occupational, or speech therapy. The disorder slowly gets worse over time.
When to see a doctor
Call 911 for sudden loss of movement, sensation, vision, or speech. Also call 911 for a sudden bad headache, confusion, a seizure, or unusual drowsiness. These can be signs of bleeding in the brain.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance, while a concierge doctor usually charges more and often works alongside insurance. Either can help you keep blood pressure well controlled to lower the risk of bleeding.
Common questions
What are the symptoms of cerebral amyloid angiopathy?
Cerebral amyloid angiopathy can cause bleeding in the brain that a person may not realize. A bleed can lead to sudden weakness, confusion, vision changes or trouble speaking. Some people also have gradual memory changes over time. Brain imaging can show signs of the condition.
Can a direct primary care doctor manage cerebral amyloid angiopathy?
A direct primary care doctor can help you keep blood pressure well controlled and manage other risk factors. This condition mostly affects older adults, and brain imaging can check for bleeding in the brain.
Is cerebral amyloid angiopathy the same as Alzheimer's disease?
Cerebral amyloid angiopathy and Alzheimer's disease are different conditions, though both involve a buildup of a protein called amyloid in the brain. Brain scans can check for bleeding in the brain and for amyloid deposits.
Sources
- MedlinePlus - Cerebral amyloid angiopathy
- National Institute of Neurological Disorders and Stroke - Dementia
- StatPearls (NCBI Bookshelf) - Cerebral Amyloid Angiopathy
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
