If you are "moderately depressed" do you really need treatment?

i took an online depression test (actually, several tests) and the result said i most likely have moderate depression. i am aware that these tests aren't completely accurate, but depression does run in my family. my siblings have a more severe depression. if mine really is just "moderate" do i need to do anything about it, or can i just ignore it? that word makes it seem not so serious. especially with all the side effects medicine can come with, won't it be better not to take medication?