Mass Gathering Medicine is a field of medicine that explores the health effects/risks of mass gatherings and the strategies that contribute positively to effective health services delivery during these events. . The reason for the development of the field of medicine gives the fact that mass gatherings generate a higher incidence of injury and illness, may be the subject to a catastrophic accident or attack with large numbers of injured or dead persons.
Among factors influencing on the demand for the health care at mass gatherings  are:
- the weather,
- duration of the event,
- if the crowd moves,
- containment of the event (fenced/contained or not),
- availability of alcohol/drugs,
- the density of the crowd et al.,
- possibility for spreading of communicable diseases 
Key purposes of Mass Gathering Medical Services at an event are:
- rapid access to the injured or ill patients,
- effective stabilizing and transporting injured or ill patients,
- on-site care for minor injuries and illnesses.
Mass gathering medicine support requires planning in advance.
- Arbon P: Mass gathering medicine: A review of the evidence and future directions for research. Prehosp Didast Med 2007;22(2):131-135
- "Public Health Preparedness for Mass Gatherings". Retrieved 2010-11-04.
- Franaszek J:Medical care at mass gatherings. Ann Emerg Med 1986;15:60-61
- Thompson JM et al:Level of medical care required for mass gatherings: The XV Winter Olympic Games in Calgary, Canada. Ann Emerg Med 1991;20(4):385-390
- Milsten AM et al: Mass gathering medical care: A review of the literature. Prehosp Disaster Med 2002;17(3):151-162
- "Communicable disease alert and response for mass gatherings". Retrieved 2010-11-04.
- De Lorenzo RA:Mass gathering medicine: A review. Prehosp Disaster Med 1997;12(1):68-72
- "Mass Gatherings and Public Health". 2007. Retrieved 2010-11-04.
- http://sis.nlm.nih.gov/enviro/massgatherings.html Public Health Preparedness for Mass Gatherings