A joint is where two or more bones come together, like the knee, hip, elbow, or shoulder. Joints can be damaged by many types of injuries or diseases, including

Arthritis - inflammation of a joint. It causes pain, stiffness, and swelling. Over time, the joint can become severely damaged.

Bursitis - inflammation of a fluid-filled sac that cushions the joint

Dislocations - injuries that force the ends of the bones out of position

Immunodeficiency disorders prevent your body from fighting infections and diseases. This type of disorder makes it easier for you to catch viruses and bacterial infections.

Immunodeficiency disorders are either congenital or acquired. A congenital, or primary, disorder is one you were born with. Acquired, or secondary, disorders you get later in life. Acquired disorders are more common than congenital disorders. 

Digestive diseases are disorders of the digestive tract, which is sometimes called the gastrointestinal (GI) tract, The digestive tract is made up of the esophagus (food tube), stomach, large and small intestines, liver, pancreas, and the gallbladder.

The first sign of problems in the digestive tract often includes one or more of the following symptoms:

Bleeding, bloating, constipation, diarrhea, heartburn, incontinence, nausea and vomiting, Pain in the belly, swallowing problems, weight gain or loss and many more