Period cramping, also known as dysmenorrhea, is a common symptom experienced by many women during their menstrual cycle. It's characterized by throbbing or aching pain in the lower abdomen, often radiating to the back and thighs. The pain can range from mild discomfort to severe, debilitating pain that interferes with daily activities. 

A urinary tract infection (UTI) is a common infection that can affect any part of the urinary system, including the kidneys, bladder, and urethra. UTIs are typically caused by bacteria entering the urinary tract, most commonly through the urethra. Symptoms can include pain or burning during urination, frequent urination, and lower back pain. Treatment usually involves antibiotics. 

A vaginal yeast infection, also known as vulvovaginal candidiasis, is a common condition caused by an overgrowth of a fungus called Candida. It can cause itching, irritation, and a thick, white vaginal discharge. While not typically sexually transmitted, factors like antibiotics, pregnancy, diabetes, and a weakened immune system can increase the risk of developing a yeast infection. Treatment usually involves antifungal medications, either topical or oral.