Acid reflux. Heartburn. Indigestion. Bloating. Nausea. Upset stomach. Constipation. Whichever condition ails you, they can all signal tummy trouble. Each year millions of Americans are diagnosed with gastrointestinal illnesses ranging from peptic ulcers to Irritable Bowel Syndrome (IBS). Women are especially vulnerable, since digestive issues occur up to 6 times more often in women than they do in men. The gastrointestinal system includes a 25-foot-long tube that processes foods and nutrients and is mainly comprised of the mouth, salivary glands, pharynx and esophagus (ingestion); the stomach, small intestine and large intestine (absorption); and the rectum and anus (excretion); plus the liver, pancreas and gallbladder. Take this quiz to learn about both common and serious digestive woes.