[The concept of illness and kidney diseases in Nahuatl medicine. Synthesis of Mesoamerican pre-Columbian medicine].

Medicine in Mesoamerican cultures began in the year 1,500 BC and ended with the conquest and destruction of Mexico-Tenochtitlan in 1521 by the Spanish conquerors. Mesoamerica began with the Olmec civilization followed by the Teotihuacans, Toltecs and Mayans, and perished during the Nahoa empire. The medicine used by the Aztecs (ticiotl) is undoubtedly the sum of all Mesoamerican medicine. The medical history of the ticiotl was recovered in the years that followed the conquest from the works of Bernardino de Sahagún, Francisco Hernández and the Cruz-Badiano codex. All these works described the use of plants and herbs in the treatment of diseases, including edema, urinary retention, kidney stones, and podagra. The Aztec doctors (Titici) were well acquainted with innumerable diseases and were excellent healers of wounds and fractures. The works of modern historians confirm the theory of the ticiotl medicine. The later used a complex and philosophically elaborated medical theory based on, religion, astronomy, divination and the polarity cold/warm; different from the four humor theory of galenic medicine. They demonstrated that every culture is capable of understanding and "inventing" the meaning of disease and its cure, even when it is different from our modern medical views.