About.com states that yogurt made with live bacteria is not likely to cause gas. BottomLinePublications states that yogurt that includes probiotic supplements and artificial sweeteners can cause bloating and gas.
About.com states that while dairy products usually are common causes of gas, hard cheese and naturally produced yogurt are not. BottomLinePublications states that yogurt containing probiotic bacteria can help with constipation, but it could also cause gas and bloating. If one is severely ill or has immune system deficiencies, the probiotic supplements in yogurt could affect the bloodstream and cause intense gas discomfort as well as sepsis, a potentially life-threatening condition.