Ive fallen sometimes, and a couple of days ago i fell and hit my head, the front of it, had a bump, so why do i have a bump on the back too? curious

Hmm, 2 bumps: The fall that you sustained a bump for in the front, unless you also hit the back would not be related. Because you have a history of many falls, you may have fallen in the past and sustained that posterior "bump." More importantly, because you fall often-See your Doctor and get an evaluation, so you can be appropriately diagnosed and treated for your fall risk issues. Best wishes!