The digestive system made up of the gastrointestinal tract (GI), liver, pancreas, and gallbladder helps the body digest food. Digestion is important for breaking down food into nutrients, which your body uses for energy, growth, and cell repair. Some digestive diseases and conditions are acute, lasting only a short time, while others are chronic, or long-lasting. 
Gastrointestinal disorders include such conditions as constipation, irritable bowel syndrome, hemorrhoids, anal fissures, perianal abscesses, anal fistulas, perianal infections, diverticular diseases, colitis, colon polyps and cancer. Many of these can be prevented or minimized by maintaining a healthy lifestyle, practicing good bowel habits, and submitting to cancer screening.
Functional disorders are those in which the gastrointestinal (GI) tract looks normal but doesn't work properly. They are the most common problems affecting the GI tract (including the colon and rectum). Constipation and irritable bowel syndrome (IBS) are two common examples.
Structural disorders are those in which the bowel looks abnormal and doesn't work properly. Sometimes, the structural abnormality needs to be removed surgically. Common examples of structural GI disorders include hemorrhoids, diverticular disease, colon polyps, colon cancer, and inflammatory bowel disease. 
The liver is the largest organ inside the body. It helps the body digest food, store energy, and remove poisons.
There are many kinds of liver diseases:
Diseases caused by viruses (hepatitis A, hepatitis B, hepatitis C, etc.)
Diseases caused by drugs, poisons, or too much alcohol (fatty liver disease, cirrhosis, etc.)
Inherited diseases (hemochromatosis, Wilson disease, etc.)
Symptoms of liver disease can vary, but they often include swelling of the abdomen and legs, bruising easily, changes in the color of your stool and urine, and jaundice, or yellowing of the skin and eyes. Sometimes there are no symptoms. 
Publications and factsheets
Digestive System Diseases (Encyclopædia Britannica) 
The Progression of Liver Disease (American Liver Foundation) 
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