I recently start checking for breast cancer but it's confusing because i always have lumps. how do you know when the lumps are cancerous?

Keep trying!: First, you are at the age that you need yearly mammograms. Second, make sure to do your breast exam at the same time every month. If you do this as routine, you will become familiar with your "lumps and bumps" and then you will know if anything changes.

Mammogram&Self-Exam: The best way to check for breast cancer is a screening mammogram. It's safe, inexpensive, and noninvasive; it is most effective after menopause; most recommend starting at age 40. Self-examination is not as highly-endorsed but i think it can be a very effective way to find cancers when done often. Lastly, having a yearly physician exam is important as well.