34 patients with chronic ulcerohemorrhagic colitis in exacerbation were treated with hyperbaric oxygenation in addition to the routine therapy. Two chambers model "Dräger" 1000 and 1200 were used. The total course of treatment included 10-12 seances with 60-75 min. exposition each. All patients improved significantly after the first 5-6 seances. The results of the treatment back up the use of hyperbaric oxygenation in the treatment of chronic ulcerohemorrhagic colitis.