Factors like genetics, age, certain medical conditions, a nutritional deficiency, an eye infection or hormonal changes in the body often contribute to thin eyelashes. Rubbing your eyes roughly and not removing eye makeup at the end of the day can also cause the delicate hairs of your lashes to fall out.
As proper routine care makes eyelashes healthier, this should be your first step to enjoy thicker lashes. You can also use some simple home remedies to promote thicker growth.
Bear in mind that each remedy will have different results in different individuals. It may take a few weeks to several months to get the desired result, and you may have to try more than one remedy to find one that works for you.