Angina is chest pain caused by restricted blood flow to the heart (called ischemia). It often occurs when you are under emotional or physical stress, such as exercise. When the heart does not get enough oxygen from the coronary arteries, you feel a squeezing chest pain or pressure across your chest that usually goes away after you stop the activity. The most common cause of angina is hardening of the arteries (atherosclerosis).

Chest pain that is fairly predictable and usually occurs when you exercise is called stable angina. It is relieved with rest or nitroglycerin. Chest pain that occurs when you are resting, or at unpredictable times, is known as unstable angina. Unstable angina can lead to a heart attack, so you should immediately call 911 if you experience symptoms.

It can be difficult to determine whether chest pain is something serious or a milder condition. For that reason, you should always see a doctor. Angina can lead to a heart attack, so you should never try to diagnose or treat it on your own.

Chest pain from angina can feel like pain due to other causes, such as heartburn, a muscle strain, or asthma. When in doubt, assume the pain is related to your heart until proven otherwise, especially if you are experiencing pain that you have never felt before.

The classic chest pain from angina feels like significant pressure, squeezing, or tightness in the center of your chest. It has been described as feeling like a band across the chest or a weight pressing down on the chest. You may also feel pain in your left arm and shoulder, neck, and jaw. Other possible sensations include indigestion, rapid or skipping heartbeat, or mild discomfort.

Coronary heart disease, which occurs when the arteries leading to the heart become narrowed or blocked by plaque, is almost always the cause of angina. Environmental situations, such as cold exposure, emotional stress, or heavy metals can induce angina.

The risk factors for angina are the same as the risk factors for developing heart disease, including:

• Age
• Male gender
• Menopause
• Family history of heart disease
• Diabetes
• Smoking or exposure to second hand smoke
• High cholesterol
• High blood pressure
• History of stroke
• Obesity
• Sedentary lifestyle
• Stress
• Thyroid disease
• Metabolic syndrome

See Atherosclerosis and Heart attack for more information about risk factors.

Your doctor may run several tests to determine the cause of your chest pain.

• Electrocardiogram (ECG). Records heart activity through electrodes fastened to your chest.
• Stress test. Measures how your heart performs when you exert yourself. You will be hooked up to an ECG machine and asked to exercise (usually on a treadmill or stationary bike) or receive a drug that causes your heart to act as it does when you exercise. The stress test also may be done with imaging (like thallium, sestimibi, or an echocardiogram) to look at the blood flow and muscle function of your heart.
• Coronary catheterization. Examines arteries to see if they are narrowed or blocked. This test involves injecting a dye into your arteries through a thin catheter.
• Other tests may include an electron beam computed tomography (EBCT) scan or cardiovascular magnetic resonance imaging (MRI).

If you will be doing an activity that usually triggers your angina, your doctor may tell you to take nitroglycerin a few minutes in advance to prevent the pain.

The best prevention for angina is to modify as many risk factors for heart disease as possible:

• Stop smoking
• Maintain a proper weight
• Control blood pressure, diabetes, and cholesterol
• Eat a diet low in saturated fats and high in whole grains, fiber, fruits, and vegetables
• Exercise at least 30 minutes per day, 5 days per week
• Reduce stress

Your doctor will treat underlying heart disease to prevent it from getting worse. By doing this, blood flow to the heart improves and angina gets better. Lifestyle changes and certain medications can improve blood flow and make you feel better fairly quickly. Keep track of what causes your angina pain, what it feels like, how often you get it, and how long it lasts. If there is a change in your pattern for the worse (for example, if it happens more frequently or with less exertion), let your doctor know right away.

Lifestyle

Changing your diet, exercising regularly, and practicing relaxation techniques to reduce your response to stress can help improve blood flow to your heart and reduce angina. These steps can also help treat your risk factors for heart disease.

Diet

A diet low in saturated fat and high in whole grains, fruits, and vegetables will help your heart and also keep your weight under control. The American Heart Association recommends that you do the following to prevent or treat heart disease:

• Eat a variety of nutritious foods, especially whole grains, fruits and vegetables, and low fat dairy products.
• Eat at least 2 servings of fish per week, particularly fish high in omega-3 fats, such as salmon, trout, and herring.
• Limit sodium intake to 1,500 mg per day.
• Limit alcohol intake to 2 drinks per day for men and 1 drink per day for women.
• Reduce your consumption of beverages and foods with added sugars.
• Burn as many calories as you take in. Get at least 30 minutes of exercise most days (or, better still, every day). If you cannot find a 30-minute block of time for exercise, aim for three 10-minute sessions during the course of the day.

Relaxation

Relaxation techniques may help reduce stress, which can be a contributing factor to heart disease, and relieve chest pain. Such practices might include the use of meditation, progressive muscle relaxation, breathing exercises, yoga, self hypnosis, or biofeedback.

Medications

For the treatment of stable angina, your doctor will likely recommend daily aspirin, as well as a combination of the following prescription medications:

• Nitroglycerin and oral nitrates. Temporarily dilate coronary arteries, allowing the heart to get more blood and oxygen.
• Beta-blockers. Slow heart rate and blood pressure, reducing the heart's need for oxygen. Never abruptly stop taking a beta-blocker, because serious side effects can occur. Talk to your doctor about how to slowly wean off of this drug. Beta-blockers include: Atenolol (Tenormin), Metoprolol (Lopressor, Toprol-XL), and Propranolol (Inderal, Inderal LA).
• Calcium-channel blockers. Slow heart rate and cause arteries to dilate. Calcium-channel blockers include Nifedipine (Procardia), Amlodipine (Norvasc), Diltiazem (Cardizem).
• Statins. Lower cholesterol, which is associated with a higher risk of heart attacks due to cardiovascular disease.
• Ranolazine (Ranexa). Due to potential side effects, this drug is used only when other anti-angina drugs do not work. It is used with other anti-angina medications, such as beta-blockers or nitroglycerin.

Recently, scientists have investigated Chinese Patent Medicines (CPM) as complementary therapies for angina symptoms with promising results. Talk to your doctor.

Surgery and Other Procedures

If lifestyle changes and medications are not effective or if unstable angina develops, you may need coronary artery bypass graft surgery, angioplasty with stent placement, or another type of procedure to improve blood flow to your heart.

See also: Atherosclerosis

Other procedures include transmyocardial laser revascularization (TMR), which is usually done along with coronary artery bypass, and, for those who are not candidates for standard treatments, a procedure called enhanced external counter pulsation (EECP). Implanting a coronary device can help improve angina symptoms when patients are not candidates for traditional surgical options.

Nutrition and Dietary Supplements

Eat a well-balanced diet with plenty of whole grains, fruits, vegetables, and low-fat dairy products. If approved by your physician, make sure you exercise at least 30 minutes a day most days of the week.

There are many supplements that can help reduce your chances of developing heart disease and its consequences, including angina.

Scientists are studying a few supplements in particular to see if they effectively reduce the pain from angina. You should never try to treat angina on your own, and you should only take supplements or herbs under your doctor's supervision. The doses given below are ones that have been used in studies. Talk to your doctor about what dose might be best for you.

• L-carnitine, an amino acid, may help reduce symptoms of angina, according to several clinical trials. L-carnitine can potentially interact with blood-thinning medications such as (Warfarin) coumadin and thyroid hormone, and possibly increase seizure risk in patients with a history of seizures.
• Coenzyme Q10 (CoQ10) is important for heart health. Several studies suggest taking it may allow people with angina to exercise more without pain. High doses of CoQ10 may interfere with some blood thinners. If you take blood thinners, talk to your doctor before taking CoQ10.
• Arginine or l-arginine is another amino acid that may improve blood flow and increase exercise tolerance in people with angina. L-arginine can increase bleeding and lower blood pressure. It can also interact with medications that treat erectile dysfunction. It can also aggravate herpes symptoms. Arginine may be inappropriate for patients with certain genetic or kidney disorders. Speak to your doctor.
• Magnesium acts similar to a calcium-channel blocker in the body, although it is much weaker. One study suggested it may help reduce chest pain caused by exercise. Magnesium can lower blood pressure and cause diarrhea, so talk to your doctor before taking it.

Herbs

The use of herbs is a time-honored approach to strengthening the body and treating disease. Herbs, however, can trigger side effects and can interact with other herbs, supplements, or medications. For these reasons, you should take herbs with care, under the supervision of a health care provider. If you have angina, do not take any herbs without your doctor's supervision.

Several different herbs that may be helpful for the treatment and prevention of heart disease, including those that help you reduce your cholesterol, blood pressure, and other risk factors.

See also:

• Heart attack
• High blood pressure
• High cholesterol

Herbs that may be helpful for angina include:

• Hawthorn (Crataegus monogyna): Has been used traditionally to treat heart disease. One small clinical trial suggested that people with angina who took hawthorn improved blood flow to the heart and were better able to exercise without pain. However, the trial was small, and more studies are needed. Hawthorn can cause side effects and interact with other drugs, so do not take it without your doctor's supervision.
• Kudzu (Pueria lobota): has been used in Chinese medicine for centuries to treat heart disease. A few clinical trials have indicated that kudzu may reduce the frequency of angina in people, but the trials were poorly designed. More research is needed. Kudzu can cause side effects and interact with other drugs. It may also have hormone-like effects and potentially aggravate liver disease. DO NOT take kudzu without your doctor's supervision.
• Terminalia arjuna, an herb used in Ayurvedic medicine, was shown in one study to be as effective as isosorbide mononitrate (Imdur) in reducing the number of angina attacks and increasing exercise capacity. However, more studies are needed.
• Suxiao jiuxin wan is widely used in China for angina. One study found that suxiao jiuxin wan improved ECG measurements and reduced symptoms and frequency of acute angina attacks compared with nitroglycerin. You should only use suxiao jiuxin under the guidance of a qualified practitioner.

Homeopathy

Homeopathy should never be used instead of immediate medical attention for unstable angina, new onset chest pain, or chest pain that has changed in intensity, frequency, or other characteristics. Homeopathy may, however, be used to help reduce your risk of heart disease, along with other medications. Although few studies have examined the effectiveness of specific homeopathic remedies, professional homeopaths would recommend appropriate therapy to lower high blood pressure and cholesterol. Before prescribing a remedy, homeopaths take into account your constitutional type. In homeopathic terms, a person's constitution is his or her physical, emotional, and intellectual makeup. An experienced homeopath would assess all of these factors when determining the most appropriate remedy for you as an individual.

Acupuncture

Studies using acupuncture to treat angina have found mixed results. While some show no benefit, others have found that acupuncture may help reduce the frequency of angina attacks and the need to use nitroglycerin. One Chinese study found that pressing fingertips to an acupuncture point located at the sternum at nipple height during a stable angina incident was as effective as taking nitroglycerin. It also worked faster than taking pills. Another study found that acupuncture combined with conventional treatment relieved angina symptoms and improved electrocardiography test results.

Prognosis and Complications

With the right treatment, including eating proper diet, getting enough exercise, and taking medication, blood flow to the heart can dramatically improve, lessening the likelihood of angina attacks.

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