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Why has my left breast been in so much pain?

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I have been having a lot of pain in my left breast for about 3 weeks to a month. The pain is on the left side of my left breast. It started out as just being a little tender when pressed on, but it has gradually got to the point it hurts without being touched. But now my right breast has started the process. I have felt a difference in mass of the breast tissue. I have went before to check a knot that came up on my right breast, but that came out fine. This is different thought. I am experiencing a tremendous amount of pain. What could this be?