Possible Causes of Foul Yellow Discharge and Lower Back Pain - Obstetrics and Gynecology

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Yellow discharge with a foul odor and a sour smell, accompanied by lower back pain?


Menstruation occurred from November 19 to November 27.
On November 27, there was unprotected sexual intercourse without ejaculation.
Following that, there was light bleeding for four consecutive days, with a light brown color.
By December 2, there was yellow discharge that had a foul, sour odor, and there was also lower back pain.
What could be the possible symptoms in this case?

Lin, 10~19 year old female. Ask Date: 2022/12/02

Dr. Cao Guotao reply Obstetrics and Gynecology


Hello, it could be inflammation.
I recommend seeing a gynecologist.
Wishing you good health.

Reply Date: 2022/12/02

More Info


The symptoms you are describing, including foul yellow discharge, lower back pain, and the timeline of your menstrual cycle, could be indicative of several potential medical conditions. It is important to consider these symptoms in the context of your overall health and any other symptoms you may be experiencing.

1. Infection: One of the most common causes of foul-smelling yellow discharge is a vaginal infection, such as bacterial vaginosis or a sexually transmitted infection (STI) like gonorrhea or chlamydia. Bacterial vaginosis is characterized by an imbalance of normal bacteria in the vagina, leading to a fishy odor and unusual discharge. STIs can also cause similar symptoms, often accompanied by other signs such as itching, burning during urination, or abdominal pain.

2. Pelvic Inflammatory Disease (PID): If the infection spreads to the reproductive organs, it can lead to PID, which may cause lower back pain, abdominal pain, and abnormal discharge. PID is often a complication of untreated STIs and can have serious long-term effects on reproductive health if not treated promptly.

3. Hormonal Changes: The timing of your symptoms in relation to your menstrual cycle is also significant. Hormonal fluctuations can lead to changes in vaginal discharge. However, the presence of foul odor and color changes suggests that an infection is more likely than a simple hormonal imbalance.

4. Cervical Issues: Conditions affecting the cervix, such as cervicitis (inflammation of the cervix), can also lead to abnormal discharge and pain. This condition can be caused by infections or irritation and may present with similar symptoms.

5. Urinary Tract Infection (UTI): While UTIs typically cause symptoms related to urination, they can also lead to lower back pain and may sometimes cause changes in vaginal discharge. The foul odor could be a result of the infection.

Given the combination of symptoms you are experiencing, it is crucial to seek medical attention. A healthcare provider can perform a thorough examination, including pelvic exams and possibly laboratory tests, to determine the underlying cause of your symptoms. They may take a sample of the discharge for analysis to identify any infections and recommend appropriate treatment, which may include antibiotics if an infection is confirmed.

In the meantime, it is advisable to avoid any irritants such as douches or scented products in the genital area, as these can exacerbate the issue. Maintaining good hygiene and wearing breathable cotton underwear can also help manage symptoms.

In conclusion, while there are several potential causes for your symptoms, the presence of foul yellow discharge and lower back pain suggests that an infection is a likely culprit. Prompt medical evaluation is essential for accurate diagnosis and effective treatment.

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