Aneurysm: Symptoms You Shouldn’t Ignore

An aneurysm can develop quietly for years without causing noticeable symptoms. In many cases, people do not know they have one until it is discovered during an imaging test performed for another reason. But when an aneurysm begins to grow, leak, or rupture, the situation can become a life-threatening medical emergency.

An aneurysm occurs when a weakened area of an artery wall becomes enlarged or bulges outward. Aneurysms can develop in different parts of the body, including the brain, aorta, abdomen, and other blood vessels. The symptoms depend heavily on where the aneurysm is located and whether it is pressing on surrounding structures or has started bleeding.

Knowing the possible warning signs can help you recognize when medical attention is urgently needed.

1. A Sudden, Extremely Severe Headache

One of the most important warning signs associated with a ruptured brain aneurysm is a sudden, severe headache.

People may describe it as a headache that comes on within seconds or minutes and feels unlike anything they have experienced before. It is sometimes called a “thunderclap headache.”

The pain may be accompanied by:

• Nausea or vomiting
• Neck stiffness
• Sensitivity to light
• Loss of consciousness
• Confusion
• Seizures
• Vision problems

A sudden, extremely severe headache should never be dismissed as an ordinary headache, particularly when it reaches maximum intensity very quickly.

If this happens, seek emergency medical care immediately.

2. Changes in Vision or Eye Symptoms

A brain aneurysm that has not ruptured can sometimes press against nearby nerves or structures.

Depending on its location, this may cause:

Blurred vision, double vision, pain around the eye, a drooping eyelid, or changes in the size of the pupils.

Some people may notice that one eye does not move normally or that their vision suddenly becomes different.

These symptoms can have many other causes, including migraines, eye disorders, nerve problems, or stroke. However, new neurological or visual symptoms require prompt medical assessment, especially when they occur suddenly.

3. Weakness, Numbness, or Difficulty Speaking

Neurological changes can be particularly concerning.

A person may suddenly develop:

• Weakness or numbness on one side of the body
• Difficulty speaking
• Difficulty understanding speech
• Loss of coordination
• Trouble walking
• Facial drooping
• Confusion

These symptoms can occur with several serious conditions, including stroke and bleeding in the brain.

Do not wait for these symptoms to disappear on their own.

Sudden neurological symptoms should be treated as an emergency because rapid evaluation can be critical.

4. Sudden or Severe Chest, Back, or Abdominal Pain

Aneurysms can also occur in the aorta, the body's largest artery.

An abdominal aortic aneurysm may cause pain in the abdomen, side, or lower back. A thoracic aortic aneurysm may cause symptoms involving the chest or upper back.

If an aortic aneurysm ruptures or begins to dissect, symptoms may become sudden and severe.

A person may experience:

Severe chest or back pain, sudden abdominal pain, dizziness, weakness, fainting, shortness of breath, or a rapid heartbeat.

The pain may be described as sudden, intense, or tearing.

These symptoms require immediate emergency medical attention.

5. A Pulsating Feeling in the Abdomen

Some larger abdominal aortic aneurysms may produce a pulsating sensation in the abdomen.

A person might feel a heartbeat-like movement, particularly when lying down.

However, feeling a pulse in the abdomen does not automatically mean someone has an aneurysm. Normal abdominal pulsations can be noticeable in some people, especially those with a thinner body build.

Still, an unusual pulsating abdominal mass—particularly when accompanied by abdominal or back discomfort—should be evaluated by a healthcare professional.

Do not repeatedly press or manipulate a suspected abdominal mass.

6. Persistent Back or Abdominal Pain

Aneurysms do not always produce dramatic symptoms.

Sometimes, an aneurysm can cause persistent or unexplained discomfort because the enlarged artery presses against nearby tissues.

Depending on its location, discomfort may occur in the:

• Lower back
• Abdomen
• Chest
• Side
• Upper back

This type of pain can easily be mistaken for muscle strain, digestive problems, or other common conditions.

The important factor is whether the symptom is new, persistent, unexplained, or different from your usual pain.

If you have persistent abdominal or back pain—particularly if you have known cardiovascular risk factors—talking with a healthcare professional is appropriate.

7. Difficulty Swallowing, Hoarseness, or Breathing Problems

Some thoracic aortic aneurysms can become large enough to put pressure on nearby structures in the chest.

Depending on the aneurysm's location and size, this may contribute to:

Difficulty swallowing, persistent coughing, shortness of breath, or unexplained hoarseness.

These symptoms are not specific to aneurysms. Respiratory infections, reflux, allergies, asthma, vocal-cord disorders, and many other conditions can produce similar symptoms.

But when persistent symptoms occur without an obvious explanation, medical evaluation can help determine the underlying cause.

Why Aneurysms Can Be So Difficult to Detect

One of the biggest challenges with aneurysms is that they may cause no symptoms at all.

A person can feel perfectly healthy while an aneurysm is developing.

Some aneurysms are discovered incidentally during imaging tests such as ultrasound, CT scans, or MRI performed for another medical reason.

This is why symptoms alone cannot reliably tell you whether you have an aneurysm.

Your individual risk factors also matter.

Factors associated with increased aneurysm risk can include high blood pressure, smoking, older age, atherosclerosis, certain inherited connective-tissue disorders, and a family history of aneurysms. Risk varies depending on the type and location of the aneurysm.

When Is an Aneurysm an Emergency?

Certain symptoms should trigger immediate emergency medical attention.

Seek emergency help for:

A sudden thunderclap headache.

Sudden severe chest or upper-back pain.

Sudden severe abdominal or back pain.

Fainting or loss of consciousness.

Sudden weakness, numbness, facial drooping, or difficulty speaking.

A sudden severe headache accompanied by vomiting, confusion, seizures, or neurological changes.

These symptoms do not prove that an aneurysm has ruptured. Other medical emergencies can cause them as well. But because potentially life-threatening conditions can present this way, waiting at home to see what happens can be dangerous.

Can an Aneurysm Be Prevented?

Not every aneurysm can be prevented, particularly when genetic factors are involved. However, managing cardiovascular risk factors can reduce the risk of developing or worsening certain types of vascular disease.

Important measures include:

Control Blood Pressure

High blood pressure places additional stress on artery walls. Regular monitoring and appropriate treatment can help reduce cardiovascular risk.

Avoid Smoking

Smoking is an important risk factor for several vascular conditions, including abdominal aortic aneurysm.

Manage Cholesterol

High cholesterol contributes to atherosclerosis, which can damage blood vessels over time.

Maintain a Healthy Lifestyle

Regular physical activity, a balanced diet, maintaining a healthy weight, and limiting excessive alcohol consumption can support overall cardiovascular health.

Know Your Family History

If close relatives have had aneurysms, discuss your family history with a healthcare professional. Depending on the circumstances, screening may be appropriate.

The Bottom Line

An aneurysm can remain completely silent, which makes awareness especially important. The symptoms that do occur depend on the aneurysm's location and whether it is pressing on nearby structures, leaking, or rupturing.

A sudden, severe headache may signal a neurological emergency. Severe chest, back, or abdominal pain may indicate a serious problem involving the aorta. New neurological symptoms, vision changes, fainting, or unexplained persistent symptoms also deserve prompt attention.

Do not wait for symptoms to become unbearable before seeking help.

Most headaches, backaches, abdominal discomfort, and episodes of dizziness are not caused by aneurysms. But certain sudden or severe symptoms can represent medical emergencies that require immediate evaluation.

Knowing the warning signs is not about living in fear—it is about recognizing when an unusual symptom deserves attention.

When something sudden, severe, or dramatically different from your normal health occurs, take it seriously and seek appropriate medical care.