Boob pain

Hi everyone, my mom's left breast has been constantly hurting bad but it's just her left breast. Anyway, I'm scared that it might be another cyst or something. She's had it before when she was 17yrs old, she's 50 now and I'm more worried cause she hasn't gotten a check up for it cause she'll be operated soon to get her mayomas out. She's also been extremely stressed out by my brother . I really don't know what it might be... maybe someone might have an idea? :(