The Centers for Disease Control and Prevention reports that the lungs, gastrointestinal system, and inner ear are the parts of the body most frequently affected by primary blast injuries, as the gas within them is susceptible. The one that goes on to kill the most people, among those who survived the initial blast itself, is blast lung. Healthline explains that this occurs as a result of air entering veins in the lungs after the explosion damages the organs.
Naturally, the impact of an explosion on the body, and the cause of death resulting from it, will depend on a range of factors, such as the type of blast and a person’s distance from it.
Alison Tompkins, via RCEM Learning, explains that the ear is the organ most often affected by blasts and that loss of hearing and tinnitus can result. Beyond that, Tompkins adds, the immediate cause of death in an explosion could be anything from impalement to burning to crushing.