What is the medical term for a severe allergic reaction?

The medical term for a severe allergic reaction is anaphylaxis. This condition is characterized by a rapid onset of symptoms that can affect multiple body systems, including the respiratory, gastrointestinal, cardiovascular, and cutaneous systems. Anaphylaxis occurs when an individual is exposed to an allergen, such as certain foods, medications, or insect stings, leading to the release of chemicals such as histamine that cause extreme inflammation and other potentially life-threatening symptoms.

The correct spelling of "anaphylaxis" is critical in a medical context, as misspelling it could lead to confusion or misunderstandings regarding the serious nature of the condition. Recognizing the signs of anaphylaxis, such as difficulty breathing, swelling, and a rapid drop in blood pressure, is essential for immediate treatment, typically with epinephrine.

The other terms provided refer to different medical conditions: anemia relates to a deficiency of red blood cells or hemoglobin; amniocentesis is a procedure used to obtain amniotic fluid for testing during pregnancy; and amenorrhea is the absence of menstruation. Each of these terms represents distinct medical concepts and is unrelated to allergic reactions, highlighting the importance of precise terminology in healthcare.