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Causes of iron-deficiency anemia include blood loss, consuming too little iron, problems absorbing iron, and certain medical conditions.

Arrhythmia is caused by changes to heart tissue. It can also occur suddenly as a result of exertion or stress, imbalances in the blood, medicines, or problems with electrical signals in the heart. Typically, an arrhythmia is set off by a trigger, and the irregular heartbeat can continue if there is a problem in the heart. Sometimes the cause of an arrhythmia is unknown.

You may have an increased risk for high blood cholesterol because of your age, your family history and genetics, and your race.

Sometimes VTE does not cause symptoms until serious complications occur. In other cases, deep vein thrombosis causes swelling or discomfort near the blood clot. Pulmonary embolism can cause chest pain and difficulty breathing. Pulmonary embolism can be a life-threatening condition.

The risk of having a baby with a congenital heart defect is influenced by family history and genetics, the mother’s health, sex, and exposure during pregnancy to environmental factors, such as smoke or certain medicines. Other medical conditions can also raise your risk for having a baby with a congenital heart defect.

The TAH replaces the lower chambers of the heart, called ventricles. Tubes connect the TAH to a power source that is outside the body. The TAH then pumps blood through the heart’s major artery to the lungs and the rest of the body.

People who do not know whether they carry an abnormal hemoglobin gene can ask their doctor to have their blood tested. Couples who are planning to have children and know that they are at risk of having a child with sickle cell disease may want to meet with a genetic counselor.

Many factors play a role in preparing your body to fall asleep and wake up. Your body has several internal clocks, called circadian clocks. These typically follow a 24-hour repeating rhythm, called the circadian rhythm. This rhythm affects every cell, tissue, and organ in your body and how they work.

You may or may not notice atrial fibrillation. It often occurs with no signs or symptoms. If you do have symptoms, you may notice something that occurs only occasionally. Or, your symptoms may be frequent or serious.

Your doctor may recommend cardiac catheterization to find out what is causing signs or symptoms of a heart problem or to treat or repair a heart problem.