a severe and rapid and sometimes fatal hypersensitivity reaction to a substance (especially a vaccine or penicillin or shellfish or insect venom) to which the organism has become sensitized by previous exposure
a severe medical condition resulting from excessive consumption of alcohol during pregnancy that can cause the child to be born with birth defects and developmental disabilities
a severe medical condition during which voice cords in one's voice box become painful and swollen, often resulting in loss of the voice or having difficulty breathing
a dangerous condition in which a person loses consciousness as a result of a blood vessel breaking open or becoming blocked in their brain, which could kill or paralyze a part of their body
absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death