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ACL injury ACL injury The anterior cruciate ligament (ACL) is one of the key ligaments that help stabilize the knee joint. The ACL connects the thighbone (femur) to the shinbone (tibia). It's most commonly torn during sports that involve sudden stops...
Acute respiratory distress syndrome (ARDS) occurs when lung swelling causes fluid to build up in the tiny elastic air sacs in the lungs. These air sacs, called alveoli, have a protective membrane, but lung swelling damages that membrane. The fluid le...
Abdominal aortic aneurysm Abdominal aortic aneurysm An abdominal aortic aneurysm occurs when a lower part of the body's main artery, called the aorta, becomes weakened and bulges. An abdominal aortic aneurysm is an enlarged area in the lower part of ...
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Absence seizures involve brief, sudden lapses of consciousness. They're more common in children than in adults. A person having an absence seizure may stare blankly into space for a few seconds. Then the person typically returns quickly to being aler...
Achalasia is a swallowing condition that affects the tube connecting the mouth and the stomach, called the esophagus. Damaged nerves make it hard for the muscles of the esophagus to squeeze food and liquid into the stomach. Food then collects in the ...
Achilles tendon rupture Achilles tendon rupture The Achilles tendon is a strong fibrous cord that connects the muscles in the back of your calf to your heel bone. If you overstretch your Achilles tendon, it can tear (rupture). Achilles (uh-KILL-eez) ...
Acne is a skin condition that occurs when your hair follicles become plugged with oil and dead skin cells. It causes whiteheads, blackheads or pimples. Acne is most common among teenagers, though it affects people of all ages. Effective acne treatmen...
Acoustic neuroma (vestibular schwannoma) Acoustic neuroma (vestibular schwannoma) An acoustic neuroma, also known as a vestibular schwannoma, is a noncancerous tumor. It develops on the balance nerve, known as the vestibular nerve, and on the auditor...
Illustration showing person with acromegaly Illustration showing person with acromegaly Symptoms of acromegaly include an enlarged face and hands. Changes to the face may cause the brow bone and lower jawbone to protrude, and the nose and lips to get...
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