Yellow vaginal discharge causes
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Common Infectious Causes of Yellow Vaginal Discharge
Yellow vaginal discharge is most often a sign of infection or inflammation in the vagina. The most common infectious causes include bacterial vaginosis, trichomoniasis, and, less frequently, other bacterial or mixed infections Agarwal2020Morris2001Wølner‐hanssen1989+4 MORE.
Bacterial Vaginosis and Yellow Discharge
Bacterial vaginosis (BV) is a leading cause of abnormal vaginal discharge in women of reproductive age. BV occurs when the normal balance of vaginal bacteria is disrupted, allowing overgrowth of anaerobic bacteria such as Gardnerella vaginalis, Mobiluncus, Bacteroides, and Mycoplasma hominis. BV can cause a yellow, grey, or homogenous discharge, often with a foul or fishy odor. Many women with BV may also experience increased discharge, abdominal pain, or irregular bleeding, but up to half may have no symptoms at all Agarwal2020Morris2001Cullins1999+3 MORE.
Trichomoniasis and Yellow Discharge
Trichomoniasis, caused by the protozoan parasite Trichomonas vaginalis, is another common cause of yellow vaginal discharge. The discharge is often described as copious, yellow or green, and sometimes frothy. It is frequently accompanied by vulvar and vaginal soreness, itching, and a strong odor. Trichomoniasis can also cause visible signs such as vaginal and vulvar redness or a "strawberry cervix" on examination Sonnex2015Wølner‐hanssen1989Cullins1999+2 MORE.
Other Bacterial and Mixed Infections
Other bacterial infections, including those caused by Staphylococcus aureus, Escherichia coli, and Klebsiella species, can also result in yellow or yellow-green purulent discharge, especially when the vaginal pH is elevated. Mixed infections, such as combinations of bacteria and yeast or bacteria and trichomonas, are also possible and can alter the color and consistency of the discharge Sumangala2018Al-Mukhtar2012.
Non-Infectious and Less Common Causes
While infections are the most frequent cause, yellow vaginal discharge can also be seen in non-infectious conditions. Desquamative inflammatory vaginitis, a rare and poorly understood condition, can present with intense vaginal redness and thick yellow discharge. Atrophic vaginitis (often seen after menopause) and chemical or irritant vaginitis (from soaps, douches, or foreign bodies) may also cause abnormal discharge, though yellow color is less typical Acosta-Benito2016Al-Mukhtar2012.
Key Points for Diagnosis and Management
- Most cases of yellow vaginal discharge are due to bacterial vaginosis or trichomoniasis, but other bacteria and mixed infections are also possible Agarwal2020Morris2001Wølner‐hanssen1989+4 MORE.
- Diagnosis should include a careful history, physical examination, and laboratory tests such as microscopy, pH testing, and specific tests for trichomonas and bacterial vaginosis Sonnex2015Agarwal2020Wølner‐hanssen1989+2 MORE.
- Proper identification of the cause is important for effective treatment and to prevent complications or recurrence Agarwal2020Cullins1999Al-Mukhtar2012.
Conclusion
Yellow vaginal discharge is most commonly caused by infections such as bacterial vaginosis and trichomoniasis, but other bacteria and non-infectious conditions can also be responsible. Accurate diagnosis using clinical and laboratory methods is essential for appropriate management and to reduce the risk of ongoing symptoms or complications Agarwal2020Morris2001Wølner‐hanssen1989+5 MORE.
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