How can one be sure if they have breast cancer or not?
There can be irregularities in the shape or size of your breast. If you observe sudden changes like rashes, redness, pain or swelling, it can be signs but to be totally sure you need to take a mammograph and the doctor will tell you the final results.
Here are few links that can be helpful:
1.Breast cancer symptoms | Breast Cancer Now
2.Myths and reality of breast cancer
3.Stages of breast cancer that you don't know about - Meteorio
4.Breast Cancer Detection, Screening & Diagnosis: How Doctors Find It