Managing patients with blast injuries can challenge emergency department operations, as patients can present in multiple waves, with occult or delayed injuries, and by personal transport, without standard prehospital care. Rapid and effective triage and evaluation includes approximation of blast proximity, determination of the category of blast - primary to quinary - and assessment of the body systems that are most likely to be injured from the type, location, and mechanism of the blast. This issue reviews the physics of the various types of explosions, how this affects the types of injuries that may be seen, and recommended treatments. Best-evidence recommendations are made for decision-making for observation, admission, or discharge.