subject: What You Must Know About Asthma [print this page] There are also internal triggers for asthmaThere are also internal triggers for asthma. A person may have an attack in the heat, from tiredness or stress. Many asthma suffers go to great extremes to prevent the possibility of an attack by freeing keeping the place where they live free of dust, pet dander, and mold. No one should smoke around a person with asthma.