Girls, my wife has some cycles of depressions and she says she feels like crying every 3-4 days?

It's going on since we are together (7 years). Initially i was not sure why is that but now i get super stressed because, she yells at me later on, and blame me for things, and now I started getting affected a lot. She says its normal and every woman goes through it. Is this really normal? If yes, how often you have this feeling and what intensity? Please help

Girls, my wife has some cycles of depressions and she says she feels like crying every 3-4 days?
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