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During puberty, a teen boy will grow taller and heavier, and hormones will lead to sexual maturity. Read on to learn what to expect.

African sleeping sickness (African trypanosomiasis) is a disease caused by a parasite. It is passed on by the bite of the infected tsetse fly.

Detailed information on hives, including what foods and medicines commonly cause them.

A mutation is a change in a gene that prevents it from working right. We inherit mutations from our parents in specific ways, one of which is called autosomal dominant inheritance.

Bacteria on the skin can cause an infection of one or more hair follicles. A hair follicle is the base or root of a hair.

A child with a communication disorder has trouble communicating with others. They may not understand or make the sounds of speech. The child may also struggle with word choice, word order, or sentence structure.

A cerebral cavernous malformation (CCM) is a collection of small blood vessels (capillaries) in the central nervous system that is enlarged and irregular in structure. In CCM, the walls of the capillaries are thinner than normal, less elastic, and likely to leak. Cavernous malformations can happen anywhere in the body. They most commonly cause symptoms when they are found in the brain and spinal cord.

A developmental venous anomaly is an unusual arrangement of small veins in the brain or spinal cord. It's a condition you are born with.

Detailed information on abdominal aortic aneurysm, including causes, symptoms, diagnosis, and treatment.