This document discusses cystitis, an inflammation of the bladder. It describes the acute and chronic forms of cystitis, including common causes such as bacterial and fungal infections. Predisposing factors like diabetes, urinary obstruction, and immune deficiency are mentioned. Gross and microscopic findings for acute, chronic, and specific types of cystitis like schistosomal and interstitial cystitis are summarized. Complications involving fibrosis and bladder cancer are also noted. The document provides an overview of cystitis and guidance on evaluation, diagnosis, and key characteristics of different cystitis types.