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Hi Eli. When this happens you are not likely damaging the brain, only the skull. The skull is quite thick and is designed precisely to withstand the types of everyday lumps and bumps we get...all the while protecting the brain inside, which is also surrounded by fluid.
Yes, that is what I am saying. The brain is generally well protected from everyday bumps and knocks. The kinds of head injuries that affect the brain adversely are high impact injuries such as helmet-less falls off a bicycle, head to head collisions during sports, motor vehicle accidents, etc. In most cases, there is at least some mild confusion in the aftermath and/or headaches, if not a loss of consciousness.
No. Brain cells are not killed by these mild knocks.
Your brain is well protected.
You will be fine.