Low-level blast is the blast generated from firing heavy weapons systems or explosives in combat or training environments. LLB exposure is not the same as concussion or traumatic brain injury. Exposure doesn't typically result in a clinically diagnosable concussion/mild traumatic brain injury.

Low-level blast exposure may cause:

• Concentration problems
• Irritability
• Memory problems
• Slowed thinking/slow reaction time
• Decreased hand-eye coordination
• Difficulty hearing
• Headaches
• Tinnitus (ringing in the ears)

Low-level blast examples:

Military occupations and heavy weapon systems that may expose service members to low-level blast include:

• Armor, artillery and gunnery
• Breaching charges
• Shoulder mounted weapons
• Explosive ordinance disposal
• Military instructor training
• .50 caliber weapons
• Indirect fire weapons

Research is still emerging on the potential health effects of low-level blast exposure. It's important to recognize the signs and report your symptoms if they persist. Medical providers and service members can learn more about blast overpressure exposure—including LLB—and TBI from TBICoE's fact sheets, short video, and infographic.