Hi. Thanks for your query, albeit short and specific. Noted the history and understood your concerns. You have not mentioned about your age, gender and details about the duration and any other associated symptoms. Yet got the point that you are passing wind but with soiling of the underwear. This can occur due to many causes such as: Procto-colitis causing the mucus secretion allowing the wind and feces to escape as holding tight does not stop passage of anything that is in the anal canal. Lax anal sphincter for local or neurological reason should also be borne in mind. This can be diagnosed by the following: Per-rectal digital examination to asses the tone of the anal sphincter muscles. Ano-proctoscopy and colonoscopy and biopsy if needed. An opinion of a General SUrgeon can help you the best. Once diagnosed the treatment is easy. If this is due to infection of the intestinal tract, a course of an antibiotic and metronidazole can help the best. If there is anything else, the treatment will be as per the causes found.