Most cases of brown vaginal discharge are actually harmless and from old blood, however it is important to be evaluated by a doctor
. Your brown discharge might be from some old endometrial tissues from the body that were not shed during the menstrual cycle. You might also have a discharge during mid-cycle bleeding with ovulation that can become thicker and darker in color which corresponds to sloughing off of uterine cells. It may also be a sign of implantation
bleeding and is an early sign of pregnancy. If not pregnant, oral contraceptive pills or an intrauterine device (IUD) can cause hormonal imbalance leading to irregular periods that may have episodes of ovulation period. In some cases, dark brown discharge can be more serious and should be checked out by a doctor. Only then you can be diagnosed and properly treated. If your discharge is heavy, soaking undergarments, or has a bad smell or is accompanied by some pelvic pain or burning with urination, you should get it checked out by a doctor. These can be symptoms of some common vaginal infections (vaginitis). A light brown discharge can also be an early symptom of pelvic inflammation disease or a sexually transmitted disease. An OB/GYN or a primary care doctor
can examine and further evaluate if this warrants treatment. Good luck.