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Accessory Breast
Accessory breast tissue is extra breast tissue that develops along the embryonic milk line, which runs from the armpit toward the groin.…
Achalasia
Achalasia is a rare swallowing disorder in which the esophagus has trouble moving food down into the stomach. The lower esophageal sphincter,…
Acid Reflux
Acid reflux happens when stomach contents, including stomach acid, flow backward into the esophagus, the tube that carries food to the stomach.…
Acne Scarring Treatment
Acne scarring is a lasting change in the skin after acne heals. Scars may be raised or indented, while temporary red or…
Acromegaly
Acromegaly is a rare hormone disorder in which the body produces too much growth hormone. In most cases, the excess hormone comes…
Actinomycetoma
Actinomycetoma is a chronic infection of the skin and tissues beneath it caused by filamentous bacteria. It usually begins when bacteria from…
Actinomycosis
Actinomycosis is an uncommon, slow-growing bacterial infection caused by Actinomyces bacteria. These bacteria normally live in the mouth and in the digestive…
Acute Limb Ischemia
Acute limb ischemia is a sudden reduction or blockage of arterial blood flow to an arm or leg. It is commonly caused…
Acute Myelogenous Leukemia
Acute myelogenous leukemia (AML), also called acute myeloid leukemia, is an aggressive cancer of the blood and bone marrow. Abnormal immature myeloid…
Acute Nasopharyngitis
Acute nasopharyngitis is a short-term infection of the nose and throat, commonly called the common cold. It is usually caused by a…
Acute Pharyngitis
Acute pharyngitis is sudden inflammation of the throat that often causes a sore throat and discomfort when swallowing. Infections, especially viral infections,…
Acute Rheumatic Fever
Acute rheumatic fever is an inflammatory immune reaction that can occur after an untreated or inadequately treated group A streptococcal infection of…
Acute Tonsillitis
Acute tonsillitis is sudden inflammation and swelling of the tonsils, the small areas of tissue at the back of the throat. It…
Addison Disease
Addison disease is a rare condition in which damaged or poorly functioning adrenal glands do not make enough cortisol and often do…
Adrenal Adenoma
An adrenal adenoma is a growth that develops in the outer layer of one of the adrenal glands, which sit above the…
Allergic Asthma
Allergic asthma is a type of asthma in which an immune response to an allergen causes the airways to become inflamed and…
Allergic Conjunctivitis
Allergic conjunctivitis is inflammation of the conjunctiva, the clear tissue covering the white part of the eye, caused by an immune response…
Allergic Rhinitis
Allergic rhinitis is an immune reaction to usually harmless airborne substances, such as pollen, dust mites, mold, or animal dander. It can…
Als Disease
ALS disease, or amyotrophic lateral sclerosis, is a progressive neurological condition also known as Lou Gehrig's disease. It damages motor neurons, the…
Alzheimer Disease
Alzheimer disease is a progressive brain disorder that gradually affects memory, thinking, language, and the ability to manage everyday activities. It is…
Amoebiasis
Amoebiasis is an infection caused mainly by the Entamoeba histolytica parasite. It usually affects the intestines but can occasionally spread to other…
Anaphylaxis
Anaphylaxis is a rapid, severe allergic reaction that can affect breathing, blood pressure, the skin, digestion, and other body systems. It can…
Anemia
Anemia is a condition in which the blood does not carry enough oxygen to the body's tissues. This often happens when there…
Angina
Angina is temporary chest discomfort that happens when the heart muscle does not receive enough oxygen-rich blood. This reduced blood flow is…
