Small vessel disease is a condition in which the walls of the small arteries in your heart — the tiny branches off the larger coronary arteries — are damaged and don’t dilate properly. Your small vessels need to expand to provide oxygen-rich blood to your heart. When they’re damaged, the blood flow to your heart decreases. This can cause serious problems in your heart that can lead to problems in other parts of the body.

It’s also called coronary microvascular disease and small artery disease.

Symptoms of small vessel disease mimic those of heart disease and even heart attack. It can be difficult to diagnose small vessel disease without proper testing to differentiate between it and other heart issues.

If left untreated, small vessel disease can be life-threatening.

Small vessel disease symptoms often mimic those of a heart attack. If you have small vessel disease, you may experience symptoms including:

You might experience these symptoms after routine daily activity or times of stress. Typical chest pain from this condition can last anywhere from 11–30 minutes or more.

If your symptoms get worse, or you experience pain beyond your chest, call your doctor immediately.

Small vessel disease occurs when the inside walls of the small vessels in your heart are damaged, affecting their ability to be able to properly dilate.

This damage may be caused by:

Anyone can develop small vessel disease, but women are at more risk.

Other risk factors are:

  • unhealthy diet
  • inactivity
  • obesity
  • tobacco smoking
  • diabetes mellitus
  • low estrogen in a woman
  • family history of heart disease
  • Diagnosing small vessel disease can be difficult. Your doctor will have to evaluate your medical history, family history, and symptoms.

    Diagnostic imaging procedures for small vessel disease are typically the same as those looking for other types of heart disease. These procedures show the structure or function of your larger coronary arteries and other parts of the heart, and may show coronary artery blockages. These tests may include:

    If there are no significant blockages in your larger coronary arteries, doctors will use an invasive test, injecting different medications into a coronary artery, to check for blockages in your small arteries during a left heart catheterization. This is called an endothelial dysfunction test. This allows the doctor to measure the blood flow through your small vessels.

    Primary treatment options for small vessel disease involve medications that relieve pain, treat risk factors, and control associated symptoms. These medications will improve arterial blood flow and prevent heart attacks.

    Some common medications are:

    Per the American Heart Association, specific studies on how to prevent small vessel disease have not been done. However, lifestyle changes and a healthy diet can reduce your risk of developing heart disease. These changes include: