How do i know if i have breast cancer?

See a doctor: Needs physical examination and likely mammogram with possible breast ultrasound depending on the woman's age and physical exam findings.

Work up: A very thorough breast examination by an experienced doctor will be able to help. In addition, a screening mammogram as per guideline is something you should do. If there is anything either on the examination or mammogram- then a sonogram and /or MRI breast can be done. Ultimately it is a biopsy of the lesion that will tell you definitively whether you have a cancer or not.