Common digestive problems include heartburn/GERD, IBD, and IBS. Symptoms may include bloating, diarrhea, gas, stomach pain, and stomach cramps. Treatment includes a combination of medication and lifestyle changes. Digestion begins in your mouth, where saliva starts to break down food when you chew. When you swallow, your chewed food moves to your esophagus, a tube that connects your throat to your stomach. Muscles in the esophagus push the food down to a valve at the bottom of your esophagus, which opens to let food into the stomach.