This document clearly demonstrates the concepts of blood pressure and its main alterations, also in diseases in which hypertension and hypotension occur and thus determines the importance of this diagnostic test of the sea included normally in the exam physical evaluation of patients, since this way the approach to a more reliable diagnosis is achieved, as well as the approach will be more complete and will offer a much smaller margin of error, contributing to the development of an assertive and complementary clinic to establish treatments and treatments treated in the different patients that appear in hospitals or veterinary offices.