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H. pylori (Helicobacter pylori) is a spiral-shaped bacteria that infects the stomach. It can damage the tissue in your child’s stomach and the first part of the small intestine. This can cause redness and swelling. It may also cause painful sores, called peptic ulcers, in the upper digestive tract.

Hirschsprung disease is a rare birth defect. It affects the nerve cells in the large intestine. These nerve cells control the muscles that move food and waste, or stool, through the large intestine. The large intestine is the last part of the digestive tract.

Lactose intolerance means your body can’t easily break down or digest lactose. Lactose is a sugar found in milk and milk products.

A liver transplant is surgery to replace a diseased liver with a healthy liver from another person.

Lymphadenopathy means swelling of the lymph nodes or glands. It can occur in just one area of the body, such as the neck. Or it may affect lymph nodes throughout the body.

Haemophilus influenzae (H. influenzae) is a group of bacteria that can cause different types of infections in babies and children. H. influenzae most often cause ear, eye, or sinus infections. They also cause pneumonia.

Meningococcal infections are not common, but they can be fatal. Learn about the causes in children, symptoms, diagnosis, treatment, and more.

An abscess is a pocket of infection. In the brain, an abscess may be in one or more areas. This condition may cause problems with how the brain and spinal cord function. It is a serious and life-threatening condition that needs to be treated right away.

An electroencephalogram (EEG) is a test that measures the electrical activity in the brain (brain waves). Small, round discs with wires (electrodes) are placed on the scalp during the test. The electrodes are not painful to your child.