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Cerebellum and brainstem Cerebellum and brainstem Lasting ataxia usually results from damage to the part of the brain that controls muscle coordination, known as the cerebellum. Ataxia describes poor muscle control that causes clumsy movements. It ca...
Atelectasis (at-uh-LEK-tuh-sis) is the collapse of a lung or part of a lung, also known as a lobe. It happens when tiny air sacs within the lung, called alveoli, lose air. Atelectasis is one of the most common breathing complications after surgery. I...
Athlete's foot (tinea pedis) is a fungal skin infection that usually begins between the toes. It commonly occurs in people whose feet have become very sweaty while confined within tight-fitting shoes. Signs and symptoms of athlete's foot include an i...
Atopic dermatitis behind the knees Atopic dermatitis behind the knees Atopic dermatitis can cause a very itchy rash. Atopic dermatitis most often occurs where the skin flexes — inside the elbows, behind the knees and in front of the neck. Atopi...
Atrial fibrillation Atrial fibrillation In a typical heart, a tiny group of cells at the sinus node sends out an electrical signal. The signal travels through the heart's upper chambers to the atrioventricular (AV) node. The signal then passes into t...
Atrial flutter Atrial flutter Atrial flutter is a type of heart rhythm disorder in which the heart's upper chambers (atria) beat too quickly. In atrial flutter, the heart's upper chambers (atria) beat too quickly. This causes the heart to beat in a f...
An atrial septal defect (ASD) is a heart condition that you're born with. That means it's a congenital heart defect. People with an ASD have a hole between the upper heart chambers. The hole increases the amount of blood going through the lungs. Smal...
Attention-deficit/hyperactivity disorder (ADHD) is a chronic condition that affects millions of children and often continues into adulthood. ADHD includes a combination of persistent problems, such as difficulty sustaining attention, hyperactivity an...
Breast anatomy Breast anatomy Each breast contains 15 to 20 lobes of glandular tissue, arranged like the petals of a daisy. The lobes are further divided into smaller lobules that produce milk for breastfeeding. Small tubes, called ducts, conduct the...
Auditory processing disorder, also called APD, is a type of hearing loss caused by something affecting the part of the brain that processes how you hear. Ear damage causes other types of hearing loss. APD is also sometimes called central auditory pro...
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