Not for a real "concussion headache." Your head is porous- sinuses, ear canals, mouth and even your eyes. All of these allow the concussive force of explosions that happen around you to interact with your brain, and it is very well established that the results of this are immediate and bad at best. Essentially, every round that goes off near your head is a small traumatic brain injury if you're not using good ear pro that is worn properly. Really the best case scenario is to wear both "over ear" and "in ear" when shooting anything big.
