isnt being hungry or tired a natural enough reason?
us women know of the pain of periods and other things, hence we think the being hungry and tired reason is pretty silly. I used to be like that, but over some years ive realised it is actually quite a big things for men… so feed em, relax them… that’ll keep em happy.. and in turn will keep us happy too 
And yeah, financial stress (if any… everyone has some im sure), kids… u always worry about them… so these are natural reasons i believe so