partial hysterectomy, bleeding after sex, mild back pain

Hi,
Welcome to ehealthforum,
After hysterectomy (removal of uterus), having vaginal bleeding during or after intercourse is not normal and could be suggestive of possibilities like vaginal infections, internal injury/trauma, cervical erosion or dysplastic changes, vaginal endometriosis, ovarian cysts, hormonal derangements affecting the bleeding pattern, anemia etc. It is difficult to comment on the cause for the abnormal vaginal bleeding that you describe without examining you. The exact cause can only be made out after careful evaluation. Visit your doctor/gynecologist at the earliest for thorough examination and further evaluation to look for the underlying cause for the abnormal vaginal bleeding that you describe. Treatment as appropriate (based on examination findings and investigations results) would be started to help you to control it. Consider being in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet. If infective cause is detected, get your partner also treated simultaneously to prevent chances of re-infection.
Take care.