What causes white discharge on the underwear of a 13-year-old girl?

Generally, the presence of white discharge on the underwear of a 13-year-old girl may be caused by normal physiological changes, incomplete physical development, onset of menstruation, bacterial vaginosis, or candidal vaginitis. It is recommended that patients visit a正规 hospital for proper diagnosis and follow medical advice for appropriate treatment. Specific analyses are as follows:

1. Normal physiological phenomenon

Leukorrhea (vaginal discharge) is a normal bodily secretion. If there is no itching or unpleasant odor, it is considered normal and may signal the approaching onset of menstruation. There is no need for concern. The patient should pay attention to diet, avoid spicy or cold foods, and maintain a healthy sleep schedule.

2. Incomplete physical development

After entering puberty, a girl's reproductive organs gradually mature. At age 13, if physical development is not yet complete and estrogen levels remain low, the endometrium may not proliferate sufficiently, leading to abnormal vaginal discharge. This is a normal condition that does not require treatment. Maintaining cleanliness and hygiene of the genital area is sufficient.

3. Onset of menstruation

Menarche typically occurs between ages 13 and 15. At age 13, menstrual periods may begin, and white discharge on underwear is often due to increased estrogen levels. This is a normal occurrence and does not require special concern—maintaining local hygiene is adequate.

4. Bacterial vaginosis

Bacterial vaginosis is mainly characterized by increased vaginal discharge with a fishy odor. The discharge is typically gray-white in appearance. Patients are advised to follow medical instructions and use medications such as metronidazole tablets, tinidazole suppositories, or dual-azole suppositories, while maintaining proper local hygiene.

5. Candidal vaginitis (yeast infection)

Candidal vaginitis is a fungal infection that causes symptoms such as perineal itching, vaginal pain, and curd-like changes in vaginal discharge. This condition can also lead to the aforementioned symptoms. Patients should follow medical guidance and use antifungal medications such as clotrimazole suppositories, nystatin vaginal tablets, or itraconazole capsules.

In addition, similar symptoms may also be caused by conditions such as urethritis or pelvic inflammatory disease. If symptoms persist or worsen, patients should seek timely medical evaluation to determine the underlying cause and receive appropriate treatment.