Changes in vaginal discharge do not always mean there is a health problem, as discharge naturally varies throughout the menstrual cycle. However, thick white discharge with itching, gray discharge with a strong odor, yellow or green discharge, or unexplained bleeding may be linked to infections or other conditions, especially when accompanied by pain, burning, irritation, or an unusual smell. A stain on underwear alone cannot determine the cause, so medical evaluation may be needed.
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