They are stomach, intestine, liver, gall bladder, pancreas.
These are related to digestion and are located in the abdomen.

We can easily observe and study them. But most of our organs are situated inside our body. These are our internal organs. We cannot see them

In plants, there are three main organs. A hollow organ is an internal organ that forms a hollow tube, or pouch such as the stomach, intestine, or bladder. In the study of anatomy, the term viscus refers to an internal organ.

Irritable bowel syndrome (IBS) is a chronic disorder in which the intestines do not work normally. Other names for IBS are spastic colon or functional bowel disease. The consequences of the malfunction of the intestines is abdominal pain that is associated with constipation, diarrhea, or constipation alternating with diarrhea. The disorder affects at least 10% of the population of North America.

The term inflammatory bowel disease (IBD) describes a group of disorders in which the intestines become inflamed. It has often been thought of as an autoimmune disease, but research suggests that the chronic inflammation may not be due to the immune system attacking the body itself. Instead, it is a result of the immune system attacking a harmless virus, bacteria, or food in the gut, causing inflammation that leads to bowel injury.

Peptic ulcers are sores that develop in the lining of the stomach, lower esophagus, or small intestine. They’re usually formed as a result of inflammation caused by the bacteria H. pylori, as well as from erosion from stomach acids. Peptic ulcers are a fairly common health problem.

Chronic constipation is infrequent bowel movements or difficult passage of stools that persists for several weeks or longer. Constipation is generally described as having fewer than three bowel movements a week.

Pancreatitis is pathologic inflammation of the pancreas. Your pancreas sits behind your stomach, near your small intestine. It releases enzymes that help you digest food and also regulates how your body manages glucose.

Appendicitis is an inflammation of the appendix, a finger-shaped pouch that projects from your colon on the lower right side of your abdomen. Appendicitis causes pain in your lower right abdomen. However, in most people, pain begins around the navel and then moves.

Diabetes is due to the damage of insulin secreting cells in pancreas or due to resistance to insulin in peripheral organs. The result is high sugar or glucose which predispose to a variety of complications including infections, kidney damage etc.

Diarhoea can be due to a variety of reasons including gastroenteritis , viral and bacterial infections. At times stress can cause frequent visit to the toilet. Profuse diarrhoea causes loss of fluid and can cause dehydration.