Question: What causes What I need to know about Gas ?
Answer: You can try to find the cause of gas by keeping a diary of what you eat and drink and how often you burp, pass gas, or have other symptoms. The diary may help you identify the foods that cause you to have gas. Talk with your health care provider if - gas symptoms often bother you - your symptoms change suddenly - you have new symptoms, especially if you are older than age 40 - you have other symptomssuch as constipation, diarrhea, or weight lossalong with gas Your health care provider will ask about your diet and symptoms. Your health care provider may review your diary to see if specific foods are causing gas. If milk or milk products are causing gas, your health care provider may perform blood or breath tests to check for lactose intolerance. Lactose intolerance means you have trouble digesting lactose. Your health care provider may ask you to avoid milk and milk products for a short time to see if your gas symptoms improve. Your health care provider may test for other digestive problems, depending on your symptoms.
Source: NIDDK