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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.

Acute liver failure is when your liver suddenly starts to not work. This often happens right after an overdose of medicine or poisoning.

Medicines taken by mouth can affect the digestive system in a number of different ways. Both prescription and over-the-counter medicines, while usually safe and effective, may cause harmful effects in some people.

Detailed information on chemical peels, including potential complications and what substances are used for chemical peels.

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.

When one of the vessels that carry blood to your eye's retina gets blocked, it can cause you to lose your eyesight. This problem often happens suddenly and without any pain. This is called a central retinal artery occlusion (CRAO).

When cancer cells spread to the bone, they can damage the bone and cause many symptoms. Learn more about how this happens, common symptoms, and how this is treated.

Some risk factors, such as family history, may not be in your control. But others--such as smoking, alcohol use, and diet--may be things you can change.

Radiation therapy kills cancer cells by focusing powerful X-rays at the tumor.