Why are my underwear yellow and have an odor?

Under normal circumstances, yellowing and unpleasant odor in underwear may be caused by sweat secretion, menstrual discharge, fungal infection, urinary tract infection, bacterial vaginosis, etc. It is recommended to seek medical attention promptly and receive appropriate treatment under a doctor's guidance. Specific causes are analyzed as follows:

1. Sweat Secretion

After exposure to high temperatures or physical exercise, sweat combined with friction against clothing can leave yellow stains on underwear. Over time, this may lead to a mild odor. Maintain good personal hygiene and change underwear regularly.

2. Physiological Period Discharge

Women often experience increased vaginal discharge during menstruation or around ovulation. This discharge can leave yellow stains on underwear and may produce an odor due to bacterial breakdown. Pay attention to personal hygiene and avoid using overly irritating cleaning products.

3. Fungal Infection

Fungal infections caused by poor hygiene habits or other factors can result in itching, burning sensations, and white discharge at the infected site. Once dried, these secretions may leave yellow stains on underwear. Inflammatory reactions and accumulated discharge can cause yellowing and odor in underwear, possibly accompanied by severe itching or pain. It is recommended to use medications such as clotrimazole suppositories, terbinafine hydrochloride tablets, or amphotericin B for injection under medical supervision.

4. Urinary Tract Infection

Urinary tract infections are associated with bacterial invasion and decreased immune function. Such infections can lead to yellowing and unpleasant odor in underwear, possibly accompanied by symptoms like frequent urination and urgency. Patients may take medications such as norfloxacin capsules, amoxicillin capsules, or nitrofurantoin suppositories under a doctor’s guidance.

5. Bacterial Vaginosis

Bacterial vaginosis is usually caused by an imbalance of vaginal flora—beneficial bacteria decrease while harmful bacteria overgrow, disrupting the microbial equilibrium. This leads to metabolic byproducts with a distinctive odor, causing yellowing and odor in underwear, possibly accompanied by mild itching or a burning sensation. Patients may use metronidazole gel, tinidazole tablets, or clindamycin cream under medical supervision.

Regularly changing and washing underwear, keeping the genital area clean and dry, and preventing bacterial growth are essential for daily care.