This document discusses insects of medical importance. It describes how some insects directly damage human tissue or act as vectors for disease. Additionally, it explains how some insects provide useful medical services and are model organisms for genetic studies. Specific examples of stinging insects that cause allergic reactions are described. The life cycles and transmission of malaria, trypanosomiasis, and Chagas disease by insect vectors are summarized. The document also outlines how venom and other insect products are used for testing allergies, treating inflammation and wounds, and in traditional medicines. It concludes by noting that insects like fruit flies and mosquitos are important genetic model organisms.