The ECG is a test that records electrical signals from your heart. The pattern of these signals can tell the healthcare provider if your heart is normal, under stress, or having electrical problems, strain, or damage.

A transthoracic echocardiogram (echo) is an imaging test. It helps your doctor assess your heart. Here's how it works.

Angiography is a special type of x-ray that allows your coronary arteries to be viewed and recorded on film. Your doctor can see if the blood vessels to your heart are clogged.

Sometimes problems with the heart's electrical signals lead to a fast heart rhythm. Too many signals may make the heart beat very fast (tachycardia). Or signals may be sent so rapidly and irregularly that the heart muscle sometimes quivers and doesn't beat at all (fibrillation).

A heart attack is an urgent message from your heart that it's starved for oxygen. Here are the warning signs to look for--and what you need to do if they occur.

Angina is often described as chest pain, but this can be misleading. Angina isn't always painful, and it isn’t always felt in the chest. Learn more about what this heart condition feels like, and when it can happen.

A nevus is a colored growth on your eye. It’s much like a mole on your skin.

Vitiligo is a common skin disorder. It makes the skin lose its natural color (pigmentation).

Dystonia is a condition that causes muscle movements that you can’t control. There are many kinds of dystonia. Focal dystonia means it happens in 1 part of the body. Task-specific means it causes problems with certain tasks, such as writing, playing a musical instrument, or playing a sport.

Tardive dyskinesia (TD) is a condition that causes repeated body movements you can’t control. It’s a side effect that some people may have when taking certain medicines for months or years.