Yesterday, i found a hard lump in my left breast (on top of breast above nipple). i have aching in my armpits but otherwise no pain.

Evaluation: This is certainly deserving of an evaluation with your doctor. Then, you may have a mammogram, ultrasound, or both. If a suspicious area is found, this will require sampling it with a needle to see what it is. Don't delay!

Seek medical care: Any palpable lump which is discoverd by the patient, her signifiant other or the health care provider needs a complete work up to determine its exact nature. Many turn out to be benign (not cancer) and some may be malignant (cancer). You need to see your doctor or a breast care specialist to have this lump checked nd diagnosed. Do not delay.