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Acquired immune deficiency syndrome (AIDS)

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Acquired immunodeficiency syndrome (AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body’s ability to fight infection and disease. HIV is a...

Acquired immunity

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Acquired immunity is a type of immunity that is developed after exposure to a disease or an antigen. It is also known as adaptive immunity or specific immunity. There are two types of acquired immunity: Active immunity: This type of immunity is developed after a...

Actinic

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Actinic damage is damage to the skin caused by exposure to ultraviolet (UV) radiation from the sun or artificial sources, such as tanning beds. The most common form of actinic damage is actinic keratosis (AK), which are precancerous skin lesions that are rough, scaly,...

Actinic keratoses

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Actinic keratoses (AKs) are precancerous skin lesions that are caused by sun damage. They are often found on sun-exposed areas of the skin, such as the face, scalp, neck, and backs of the hands. AKs are typically pink or flesh-colored, and they may be rough or scaly....

Acupressure

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Acupressure is a form of alternative medicine that involves applying pressure to specific points on the body, called acupressure points. These points are thought to be connected to energy pathways, or meridians, that run throughout the body. By applying pressure to...