there are three chambers to the lungs and to listen to all of them efficiently-the dr has to put the stethoscope in 4 different places. once on your upper back (near your shoulder blades), once on the sides of your waist, once on your lower back and then in the front at the center of your chest which is close to your heart.
Chewing gum can also lead to swallowing air, which can cause bloating. If you've got a gum habit, alternate chewing gum with sucking on a piece of hard candy or eating a healthy, high-fiber snack like fruit, vegetables, or lower-fat popcorn.
Bloating can be caused by diet, particularly if someone has a high salt intake or eats a lot of gas-producing foods, such as dark leafy vegetables or beans. Calcium supplements can also cause gas in some people. A simple reflex like inhaling can be the cause of bloating. Some people actually swallow more air in as a result of stress, or simply when they eat. Chewing on gum and smoking can also make you inhale more air, aggravating the discomfort.