i am leeking a brownish fluid from my left nipple what could this be?

absolutely get this checked out! there are so many things it could be, not all dangerous, but a good idea. I would go to a dr. who specializes in conditions of the breast, and find a dr. who actually seems concerned and doesnt have a wait and see attitude-good luck.

Hi Anon,

Nipple discharge in a woman who's not pregnant or breast-feeding isn't necessarily abnormal, but should be evaluated by a doctor.

Possible causes of nipple discharge include:

Abscess
Breast cancer
Breast infection
Excessive breast stimulation
Fibroadenoma
Fibrocystic breasts
Ductal carcinoma in situ (DCIS)
Galactorrhea
Hormone imbalance
Injury or trauma to the breast
Intraductal papilloma
Mammary duct ectasia
Medication use
Paget's disease of the breast
Pregnancy
Prolactinoma

http://www.mayoclinic.com/health/nipple-discharge/MY00467/DSECTION=causes

Please see your doctor to determine the cause of your discharge.

Best Wishes,

Rosa