Without a doubt, the greatest challenge of the 21st century is the climate emergency, as it threatens the planet's living species and affects people in all their social and economic activities. Global warming, caused by various industrial activities (oil, mining, food, livestock and others), is generating increasingly frequent climatic alterations throughout the world, causing mental health problems in the affected human populations, the same ones that have been categorized as Ecoanxiety by the global scientific community. The present research seeks to know the degree of perception that university students have about these changes or climatic events that occur in their environment and their impact on their mental health. The questions posed in this research delve into the perception of respondents who have experienced extreme events related to climate change, such as: What actions do they take? Did you have any discomfort or problems? Have you felt anxiety? The objectives of the research are: to determine the actions they have taken after experiencing an extreme event related to climate change; determine whether those who experienced these extreme events suffered discomfort or problems of various kinds, such as psychological and social, and; determine if they have felt anxiety. This research is qualitative. It is basic and descriptive, because it describes the behaviors, attitudes, expectations and beliefs regarding ecoanxiety. Likewise, it is inductive since it allowed us general conclusions in the application of the research instrument. It is deductive because we can obtain conclusions about the effects of ecoanxiety in these San Marcos students. The methodology to obtain the information was through a questionnaire-scale. Among the results obtained we can see that between 80% and 90% of those surveyed carry out actions favorable to the environment; 60% had health-related discomforts or problems and of those, 35.5% were “almost always or always” and 15.8% reported sleeping problems. Likewise, 25.4% felt “paralyzed” after a weather event, while 10.3% had problems eating. Another 10.1% had stomach problems and 17.5% indicated they had visual perception problems. Other reported problems refer to calculating time (30.6%), performing complex tasks (25.4%), walking after a weather event (18.7%). In conclusion, we deduce that those who have suffered an extreme event caused by climate change have participated in different actions in favor of the environment and the fight against climate change and at the same time have suffered discomfort or problems associated with health, with visual perceptions, problems in walking, etc., but they did not experience major problems regarding memory loss (90%).