Ulcerative colitis was first described in 1859 from Samuel Wilks, a physician at Guy's hospital in London. The prevalence in the high incidence areas ranges from 80 to 120/100.000/year. Ulcerative colitis is a chronic relapsing or chronic active disease which starts at the rectum and presents with a continuous inflammation. Primarily young adults are affected (20 to 40 years of age) but the disease may present at all ages, from younger than 1 year of life to the 80s. Many series show a secondary peak in incidence in the elderly. In the present review we will focus on the basic principles of the therapy with regard to the variety of disease manifestations. The therapeutic algorithms will be described separately for the induction of remission and the maintenance of remission. The localization of inflammation and disease activity represent crucial factors which have to be considered. With regard to these factors, the therapeutic regimens range from simple local therapy with aminosalicylates to systemic immunosuppressive therapy, which will in extreme cases require the administration of ciclosporin. Since ulcerative colitis is associated with an increased risk in developing colon carcinoma, medical therapy as well as endoscopic surveillance are fundamental in the prevention of carcinoma. In the end an outlook to future therapeutic targets and strategies will be provided.