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1. ACL injury - Symptoms and causes - Mayo Clinic

   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...

2. ARDS - Symptoms and causes - Mayo Clinic

   Acute respiratory distress syndrome (ARDS) occurs when fluid builds up in the tiny, elastic air sacs (alveoli) in your lungs. The fluid keeps your lungs from filling with enough air, which means less oxygen reaches your bloodstream. This deprives you...

3. Abdominal aortic aneurysm - Symptoms and causes - Mayo Clinic

   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 ...

4. Abdominal pain - Mayo Clinic

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5. Absence seizure - Symptoms and causes - Mayo Clinic

   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...

6. Achalasia - Symptoms and causes - Mayo Clinic

   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 ...

7. Achilles tendon rupture - Symptoms and causes - Mayo Clinic

   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) ...

8. Acne - Symptoms and causes - Mayo Clinic

   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...

9. Acoustic neuroma - Symptoms and causes - Mayo Clinic

   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...

10. Acromegaly - Symptoms and causes - Mayo Clinic

    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...