Popularly and from different information sources it is mentioned that the Citrus limon L. juice is useful to lower blood pressure. This could be due to the presence of both flavonoids and vitamin C. The aim of this work was to analyze the use of C. limon juice in the management of blood pressure sudden rises. In order to achieve this, the chemical composition of C. limon fruits available at Concepción city by means of spectroscopic and chromatographic methods. In order to characterize the use of the juice, a survey was applied to 506 hypertensive patients from the Dr. Víctor Manuel Fernández Family Health Center CESFAM in Concepción city. A pilot study with five hypertensive patients was also carried out to assess the effect of the juice against a sudden rise of blood pressure. As outcomes, polyphenols present in the C. limon juice were identified. Among these, erioctitrin, heperidin and diosmin can be mentioned. With respect to data collected from the survey, 95.2% of the surveyed population has ever used C. limon juice against a sudden blood pressure rise, with an improvement in the symptoms in about 30 minutes. In the pilot study, a decrease in the blood pressure of hypertensive patients was observed. This decrease tends to be sustained over time, unlike in normotensive patients. The use of C. limon juice against a sudden blood pressure rise is widely rooted in popular culture and it was concluded that this juice decreases blood pressure by means of a non established action mechanism, probably related to the content of polyphenols and vitamin C. Antihypertensive effects have been attributed to these compounds.