Street medics work under the philosophy of "do no harm," meaning that medics use treatments that must never harm the patient more than they help. Because different medics have different levels of training, they will be able to provide different types of care. Street medic organizations in different cities or regions plan training programs that focus on treating demonstration-related injuries and plan medical coverage of upcoming demonstrations. Sometimes an affinity group will include one or more trained street medics to attend specifically to members of that group.