The bottom casing of my computer keeps coming off

[Johnbstavi]

So whenever I open my computer, the casing on the bottom part of my laptop keeps opening up. I have to manually hold my laptop together while I open it up and if I don’t it bulges out and the internal part of it is shown. I was wondering if I should take it in somewhere to be fixed or if there is something that I can do to fix it. 

[pbroussard]

Without the specific model number of your laptop, it's hard to definitively say, but have you ever taken the bottom cover off, if so did you reinstall the screws?