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An atrial septal defect is an opening in the wall that separates the upper chambers of the heart. It is a type of congenital heart

Amphetamines are drugs that speed up (stimulate) the nervous system. They can raise a person's heart rate and blood pressure. They

Alopecia areata is a type of hair loss that affects the hair on the scalp or other areas of the body. The condition happens when

Acute respiratory distress syndrome (ARDS) is an emergency situation in which fluid buildup in the lungs causes breathing failure

An abdominal ultrasound uses reflected sound waves to produce a picture of the organs and other structures in the upper abdomen

A bacterial infection is an infection caused by bacteria. Bacterial infections can often be treated successfully with antibiotics

Bell's palsy is a paralysis or weakness of the muscles on one side of the face. It causes one side of the face to droop and

The basal body temperature (BBT) is a person's at-rest temperature. Natural cyclic changes in female hormones usually cause a

In Barrett's esophagus, also called Barrett's syndrome, the cells that line the inside of the esophagus are replaced by cells like

A barium enema, or lower gastrointestinal (GI) examination, is an X-ray examination of the large intestine (colon and rectum). The