Question for Betty.
 

Postmenopausal vaginal brown spotting sometimes reddish in color with lower back pain?

 
Betty's Answer.
 

If you are having postmenopausal uterine  bleeding, you need to be evaluated as soon as possible for the source of the bleeding. The most common causes of bleeding may be atrophy of the vaginal mucosa or endometrium, polyps or fibroids.  However, endometrial carcinoma, a potentially lethal disease, is the cause of bleeding in 10 to 25% of post menopausal women.  Bleeding also may be coming from the urethra, bladder and rectum/bowel.  The exception with uterine bleeding is if you are taking hormone therapy you can expect to be having cyclic bleeding. 

Be sure to make an appointment ASAP for evaluation with your health care provider.