Cerebral Amyloid Angiopathy

Overview

Cerebral amyloid angiopathy (CAA) is a condition in which a protein called amyloid builds up in the walls of small blood vessels in the brain. This makes the vessels fragile and more likely to leak or bleed. It is not a cancer or an infection, and it is not contagious.

CAA becomes more common with age. Some degree of amyloid buildup can be found in a large number of people over 60, but only a small fraction will ever have symptoms or a bleed.

It most often affects people in their 60s and older. Sometimes it runs in families and can affect younger people, but this is rare. Both men and women can have CAA.

Symptoms

Common symptoms

• Many people have no symptoms at all.
• Sudden, severe headache
• Weakness or numbness on one side of the face, arm, or leg
• Confusion or trouble speaking
• Vision changes, such as blurred vision or loss of vision in one eye
• Balance problems or dizziness
• Seizures

Causes

Main causes

• A build-up of amyloid protein in the walls of small brain arteries
• The exact reason for the build-up is not fully understood
• It is not caused by anything you ate, drank, or did
• It cannot be passed from person to person

Risk factors

• Older age
• Long-term high blood pressure
• A family history of CAA or early brain bleeds
• Certain genes, including the APOE ε4 variant, which can also be linked with Alzheimer's disease
• Having had a previous bleed in the brain

When to see a doctor

See a doctor urgently if:

• Call your local emergency number right away if you have any stroke-like symptoms, such as sudden weakness, drooping face, trouble speaking, or vision changes.
• Go to the emergency department if you have a sudden, very severe headache.
• Seek immediate help if you have a seizure or lose consciousness.

Book a routine appointment if:

• Make an appointment with your family doctor if you are 65 or older and have new or worsening headaches, memory problems, or dizzy spells.
• If you have a family history of CAA, talk to your doctor about whether you need any tests or monitoring.
• Have your blood pressure checked regularly, especially after age 60.

Diagnosis

CAA is most often found on a brain scan, such as an MRI or CT scan, that shows characteristic small areas of bleeding. Your doctor will also do a full neurological examination and ask about your symptoms and medical history. You may be referred to a neurologist or stroke specialist.

Tests that may be done

• MRI scan, especially with special sequences that show tiny bleeds
• CT scan of the head
• Blood pressure and blood tests to rule out other causes
• Sometimes a lumbar puncture (spinal tap) to look for amyloid markers
• In rare cases, a brain biopsy may be offered, but this is uncommon

What to expect at your appointment

The diagnosis is usually based on imaging plus your symptoms and history. It may take a few appointments. If the doctor advises genetic testing, they will explain what it means. You should leave the appointment knowing your diagnosis and the next steps.

Treatment

There is no cure yet for CAA, but the condition can be managed. The main goals are to control blood pressure and reduce the chance of bleeding. Your doctor will talk to you about what is safe and what to avoid.

Self-care at home

• Keep your blood pressure in the target range your doctor recommends.
• Avoid heavy lifting, straining, or any activity that makes you hold your breath.
• Avoid taking any new medicines or supplements without asking your doctor first. Some, like blood thinners and certain pain relievers, can increase bleeding risk.
• Try to prevent falls by keeping your home well lit and removing trip hazards.
• Let family or friends know the warning signs of a stroke and how to call for help.

Medical treatments

Medications to lower blood pressure are the cornerstone of treatment. If you have a heart or blood vessel condition that requires blood-thinning medicine, your specialist will weigh the risks and benefits very carefully. Some experimental treatments that target amyloid are being studied, but they are not widely available yet.

When is surgery considered?

Surgery is rarely needed for CAA itself. It may be considered only if a large brain bleed is causing dangerous pressure on the brain. In that situation, a neurosurgeon will discuss the options with you and your family.

Living with this condition

If you have CAA, you can still live a full life, but you may need some adjustments. Take your blood pressure medicines exactly as prescribed, attend your check-ups, and avoid activities that put sudden strain on your head. Consider telling the people close to you about your diagnosis and what to do in an emergency.

Lifestyle tips

• Keep a healthy blood pressure by eating little salt and staying active.
• Do not smoke, and limit alcohol.
• Get enough sleep and manage stress with activities like walking, gardening, or talking to friends.
• Stay mentally active with reading, puzzles, or hobbies you enjoy.

Diet and exercise

A balanced diet with plenty of vegetables, fruit, whole grains, and lean protein is good for your brain and your heart. Regular, gentle exercise such as walking or swimming is generally safe, but confirm with your doctor before starting a new routine. Avoid very high-intensity weightlifting or any exercise that involves heavy straining.

Mental health and emotional wellbeing

A diagnosis like this can bring worry or low mood. It is completely normal to feel anxious. Speak to your doctor about these feelings. If you ever feel overwhelmed or in crisis, do not stay alone — call your local emergency number or a mental health helpline.

Prevention

You cannot prevent the amyloid build-up itself, because it is linked to ageing and genetics. However, you can reduce the risk of a bleed by controlling high blood pressure, not smoking, and being careful with medicines that thin the blood.

Complications

If left untreated

• A brain bleed (hemorrhagic stroke) that can cause permanent brain damage or disability.
• Repeated small bleeds that can lead to memory loss or thinking problems over time.
• Seizures.
• Loss of independence due to the effects of stroke.

Long-term outlook

It is hard to predict how CAA will affect any one person. Many people never have a serious bleed, especially if their blood pressure is well controlled. There are treatments to lower risk, and doctors are learning more every year. With the right medical care and a good support system, many people with CAA continue to enjoy life for years.

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