The document discusses cystitis, or urinary bladder inflammation. It defines cystitis as a urinary tract infection that affects the bladder. The most common cause is bacterial infection, which can occur when bacteria enter the bladder from the urethra or anus. Common symptoms include pain or burning during urination, frequent urination in small amounts, and bloody or cloudy urine. Treatment typically involves antibiotics and self-care measures like drinking water and avoiding irritants. Preventative measures include proper hygiene and not delaying urination.