A urinary tract infection, or UTI, is an infection of any part of the urinary system, including the kidneys, ureters, bladder and urethra. They are a common condition, especially in women, and can cause a range of symptoms from mild discomfort to severe pain. UTIs are caused by bacteria entering the urinary system, which can be spread through sexual contact or by improper hygiene. The most common symptom of a UTI is a burning sensation when urinating, but other symptoms can include frequent urination, cloudy or bloody urine, abdominal and back pain, and fever. In most cases, UTIs can be treated with antibiotics. However, if left untreated, they can lead to more serious complications such as kidney infection and sepsis. To reduce the risk of a UTI, it is important to practice good hygiene, drink plenty of fluids, and avoid sexual contact when infected.