Yellow Discharge with Odor and Back Pain: Possible Causes - Obstetrics and Gynecology

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The symptoms you are experiencing, including yellow discharge with a foul odor and back pain, can be indicative of several potential medical conditions. Given the timeline of your menstrual cycle and the nature of the discharge, it is essential to consider a few possibilities.

1. Bacterial Vaginosis (BV): This is a common condition caused by an imbalance of bacteria in the vagina. Symptoms often include a thin, yellow or gray discharge with a strong fishy odor, especially after sexual intercourse. The presence of back pain can also occur, although it is not a classic symptom of BV. The foul odor and the change in discharge color you described could suggest this condition.

2. Sexually Transmitted Infections (STIs): Certain STIs, such as gonorrhea or chlamydia, can cause abnormal discharge, often accompanied by a foul smell. These infections may also lead to pelvic inflammatory disease (PID), which can cause back pain and other systemic symptoms. Given that you mentioned unprotected sexual intercourse, it is crucial to consider the possibility of an STI.

3. Cervical Infection: An infection of the cervix, often due to STIs or other pathogens, can lead to yellow discharge and discomfort. This type of infection can also cause pelvic pain, which may radiate to the back.

4. Endometritis: This is an inflammation of the inner lining of the uterus, often due to infection. It can occur after menstruation or childbirth and may present with abnormal discharge, odor, and pelvic or back pain.

5. Urinary Tract Infection (UTI): While UTIs typically cause urinary symptoms, they can sometimes present with back pain and may lead to changes in vaginal discharge due to irritation or secondary infections.

6. Hormonal Changes: After menstruation, hormonal fluctuations can lead to changes in vaginal discharge. However, the presence of a foul odor is not typical and should be evaluated further.

Given these possibilities, it is essential to seek medical attention promptly. A healthcare provider will likely perform a pelvic examination, take a detailed history, and may conduct laboratory tests, including a vaginal swab, to identify the cause of your symptoms. Treatment will depend on the underlying condition identified.

In the meantime, it is advisable to avoid any irritants, such as douches or scented products, and to maintain good hygiene. If you experience any worsening symptoms, such as fever, severe pain, or increased discharge, seek immediate medical care.

In summary, the combination of yellow discharge with a foul odor and back pain can be indicative of several conditions, including bacterial vaginosis, STIs, cervical infections, endometritis, or UTIs. A thorough evaluation by a healthcare professional is necessary to determine the exact cause and appropriate treatment.