Well, in common, it is very normal to have eyelashes falling out. So you do not have to worry about it too much, unless the falling out is very serious. First, you should know that there are many reasons which can cause it. Generally speaking, using some cosmetic products, such as mascara and eye make-up, can be the most common one, for in this way, it can be the allergy to your eyelashes. According to some experts, eyelash curlers tug can cause breakage of the eyelashes. And anyway, if your situation is just caused by something I have said above, you just need to stop using it.