Answer: Some people are just sad because they don't have money aka pesos ( Mexican money) or they are just upset about something like family problems. most commonly is depression of a lost one because when something happens for example if they get bit by a black widow or get sick they can't do anything because Mexico does not have as good a hospitals as we do here. They do have some Pepto medication that can lessen the pain and sickness.
hope this helps :}