Anaphylactic shock is the type of shock most commonly associated with severe allergic reactions because it results from a rapid, systemic IgE-mediated hypersensitivity response. This causes widespread release of histamine and other mediators leading to vasodilation, increased vascular permeability, and bronchospasm, which collectively cause hypotension and airway obstruction. This rapid onset of circulatory collapse differentiates it from other shock types. Prompt recognition and treatment with epinephrine are critical to reverse these life-threatening effects.

Reference: Harrison's Principles of Internal Medicine, Fauci et al., 20th Edition.