What an aneurysm feels like depends on where it is and whether it has ruptured

An unruptured aneurysm — a bulge in an artery wall that has not burst — often causes no sensation at all. You can have one for years without knowing. If it does cause symptoms, they come from the aneurysm pressing on nearby tissue or nerves, and the feeling depends entirely on location. A brain aneurysm might cause a headache in one spot that does not go away. An aneurysm in the chest or abdomen might create a dull ache or a sense of pressure.

A ruptured aneurysm is a medical emergency and feels unmistakable. The sensation is sudden, severe, and unlike anything the person has felt before. A ruptured brain aneurysm causes an explosive headache — people often describe it as "the worst headache of my life." A ruptured aneurysm elsewhere causes sudden, intense pain at the rupture site, often with shock symptoms like dizziness, weakness, or loss of consciousness.

Key Takeaways

  • An unruptured aneurysm may cause no symptoms, or a persistent dull ache or pressure depending on what it is pressing against.
  • A ruptured aneurysm causes sudden, severe pain that feels different from any pain you have had before, and requires emergency care immediately.
  • Brain aneurysm symptoms include a sudden severe headache, stiff neck, sensitivity to light, nausea, or loss of consciousness.
  • Chest or abdominal aneurysm symptoms include sudden sharp pain, weakness, sweating, or feeling faint.
  • Call 911 or go to an emergency room if you experience sudden severe pain anywhere, especially if it is accompanied by neurological changes.

Symptoms of an unruptured brain aneurysm

Most unruptured brain aneurysms produce no symptoms and are found by accident during imaging for another reason. When they do cause symptoms, it is usually because the aneurysm has grown large enough to press on brain tissue or a nerve. The most common symptom is a headache in a specific location — often behind the eye, on one side of the head, or at the base of the skull — that persists for weeks or months and does not respond to over-the-counter pain relief.

Some people report a dull, throbbing sensation rather than sharp pain. Others describe it as pressure or heaviness. If the aneurysm presses on the nerve that controls eye movement, you might notice double vision or drooping of one eyelid. Pressure on other nerves can cause facial pain, numbness, or weakness on one side of the face. These symptoms develop slowly and stay relatively stable unless the aneurysm grows or begins to leak.

Symptoms of a ruptured brain aneurysm

A ruptured brain aneurysm causes a sudden, catastrophic headache that reaches maximum intensity within seconds or minutes. People who have experienced both describe it as completely different from a migraine, tension headache, or any other type of headache they have had. The pain is often described as explosive, thunderclap-like, or as if something burst inside the head. It is typically felt all over the head rather than in one location.

Along with the headache, a ruptured brain aneurysm often causes a stiff neck (pain when bending the chin toward the chest), sensitivity to light, nausea or vomiting, confusion, loss of consciousness, or seizures. Some people lose consciousness immediately. Others remain awake but confused or unable to speak clearly. These symptoms appear suddenly and together, not gradually. If you experience a sudden severe headache unlike any you have had before, especially if it is accompanied by neck stiffness, light sensitivity, or confusion, call 911 immediately.

Symptoms of an unruptured chest or abdominal aneurysm

An unruptured aneurysm in the chest (thoracic aorta) or abdomen (abdominal aorta) may cause no symptoms at all, or a dull, persistent ache in the chest, back, or abdomen. The pain is usually not sharp and may feel like general discomfort or pressure rather than acute pain. Some people describe it as a deep ache that comes and goes. Because these aneurysms grow slowly, symptoms — if they appear — develop gradually over weeks or months.

You might also feel a pulsing sensation in the abdomen, as if you can feel your heartbeat in your belly. This is sometimes noticeable when lying down. Some people report back pain, particularly between the shoulder blades or in the lower back, that does not improve with rest or stretching. These symptoms can be easy to dismiss as muscle strain or general discomfort, which is why many chest and abdominal aneurysms are discovered during imaging done for other reasons.

Symptoms of a ruptured chest or abdominal aneurysm

A ruptured aneurysm in the chest or abdomen causes sudden, severe pain that is often described as tearing or ripping. The pain may start in the chest or back and move downward, or it may be localized to the abdomen. It is intense enough that people often cannot ignore it or continue normal activity. The pain is accompanied by other signs of shock: rapid heartbeat, sweating, weakness, dizziness, or fainting. Some people feel cold and clammy.

If the rupture is in the abdomen, you may notice bruising or discoloration of the skin around the abdomen or flanks. If it is in the chest, you might have difficulty breathing or feel pressure in the chest. Loss of consciousness can occur quickly. A ruptured chest or abdominal aneurysm is a life-threatening emergency — call 911 immediately if you experience sudden severe pain in the chest, back, or abdomen, especially if it is accompanied by weakness, sweating, or fainting.

When to go to the emergency room versus calling 911

Call 911 if you experience sudden severe pain anywhere in your head, chest, back, or abdomen, especially if the pain is unlike anything you have felt before. Do not drive yourself to the hospital. Do not wait to see if the pain goes away. Sudden severe pain in these locations can indicate a ruptured aneurysm or another life-threatening condition, and emergency responders need to know immediately.

Call 911 also if the sudden pain is accompanied by any of these: loss of consciousness, confusion, difficulty speaking, weakness or numbness on one side of the body, difficulty breathing, fainting, or severe sweating. These are signs that the rupture is affecting your brain or vital organs. If you have a persistent dull headache, chest ache, or back pain that has lasted for weeks and is not severe, you can contact your primary care doctor to discuss whether imaging is needed. But if the pain is sudden and severe, treat it as an emergency.

Why location matters for what you feel

The location of an aneurysm determines what you feel because it determines what tissue or nerves the bulging artery is pressing on. A brain aneurysm near the optic nerve causes vision problems. One near the trigeminal nerve causes facial pain. An aneurysm in the chest presses on lung tissue or the esophagus. One in the abdomen presses on the stomach or intestines. The larger the aneurysm grows, the more pressure it exerts, and the more noticeable the symptoms become.

This is also why the same aneurysm can feel different to different people. Two people with aneurysms of similar size in similar locations may have different symptoms depending on exactly which structures are being compressed. One person might have a headache; another might have vision changes. One person might have back pain; another might feel a pulsing sensation. The only universal rule is that a ruptured aneurysm, wherever it is, causes sudden, severe pain and requires immediate emergency care.

Frequently Asked Questions

Can you feel an aneurysm before it ruptures?

Sometimes, but not always. Many unruptured aneurysms cause no symptoms at all. If symptoms do occur, they develop slowly and feel like a persistent dull ache, pressure, or localized headache. A ruptured aneurysm, by contrast, causes sudden severe pain that feels completely different and requires emergency care.

What does a brain aneurysm headache feel like?

An unruptured brain aneurysm may cause a dull, persistent headache in one location that does not respond to pain relief. A ruptured brain aneurysm causes a sudden, severe headache that reaches maximum intensity within seconds, often described as explosive or thunderclap-like. It is usually accompanied by neck stiffness, light sensitivity, nausea, or confusion.

Can you have an aneurysm and not know it?

Yes. Most unruptured aneurysms cause no symptoms and are discovered by accident during imaging done for another reason. You could have an aneurysm for years without knowing. This is why imaging may be recommended if you have risk factors like high blood pressure, a family history of aneurysm, or certain genetic conditions.

Is sudden severe pain always an aneurysm?

No. Sudden severe pain can indicate many conditions, including heart attack, stroke, kidney stones, or other emergencies. What matters is that sudden severe pain in the head, chest, back, or abdomen always requires emergency evaluation. Call 911 and let medical professionals determine the cause.

What should I do if I think I have aneurysm symptoms?

If you have sudden severe pain, call 911 immediately. If you have a persistent dull ache or headache that has lasted weeks, contact your primary care doctor to discuss whether imaging is needed. Do not assume a persistent symptom is an aneurysm, but do not ignore it either — your doctor can help determine whether further evaluation is necessary.