What are two of the top causes of eyelashes falling out?

 1. Stress 

Emotional stress could cause hair loss, including your lashes.

2. Beauty Habits

Not-so-healthy beauty habits, such as sleeping with mascara and curling eyelashes with a curler, can result in damage to your eyelashes. Having eyelash extensions can also cause friction. The glue, extra weight, and pulling involved in removal can cause lash loss.