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An adjustment disorder is an unhealthy emotional or behavioral reaction to a stressful event or change in a person's life. The response happens within 3 months of the stressful event.

Whooping cough (pertussis) is a contagious illness. It causes intense fits (paroxysms) of coughing. It mainly affects babies and young children.

From babies to teens, a look at how children understand death.

Puberty that happens early is called precocious puberty. This means a child's physical signs of sexual maturity develop too soon. This includes breast growth, pubic hair, and voice changes. These are known as secondary sexual characteristics. Precocious puberty happens before age 8 in girls, and before age 9 in boys.

Schizophrenia is a serious mental illness. It is a long-lasting and disabling problem of the brain. A child with this disorder has unusual behavior and strange feelings.

Some risk factors, such as family history, may not be in your control. But others may be things you can change. Knowing the risk factors can help you make choices that might lower your risk.

After a diagnosis of head and neck cancer, you will likely have other tests. These tests help your healthcare providers learn more about your cancer.

An overview of common treatments for head and neck cancer.

Learn about how surgery is used to treat head and neck cancer, and what to expect before and after surgery.