Extreme height refers to individuals with exceptional stature, either unusually tall or short. The tallest person ever recorded was Robert Wadlow, measuring 8 ft 11.1 in (2.72 m), while the shortest was Chandra Bahadur Dangi, standing at 21.5 in (54.6 cm). Organizations like Tall Club International and Little People of America provide support to individuals with extreme height. Height is typically measured in inches, feet, meters, or centimeters, with each unit having advantages and disadvantages. Medical conditions such as achondroplasia, gigantism, and pituitary tumors can influence height. Societal perspectives on height can involve discrimination (heightism) and stereotypes. Height is influenced by genetics, BMI, HGH, and environmental factors.