A UTI results when bacteria enter the urethra and multiply inside the bladder. During menopause, falling estrogen levels can upend the vagina’s bacterial balance, making it more susceptible to infection. UTIs generally present with urinary urgency, a burning sensation when passing urine, a change in the color or odor or urine, and/or pain in the pelvic region. Fever and/or nausea may occur. UTIs must be treated as quickly as possible to avoid kidney damage. See Long-Term Health Risks.