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Overview Attention deficit hyperactivity disorder (ADHD) is a group of behavioural symptoms that include inattentiveness, hyperactivity and impulsiveness. Symptoms of ADHD tend to be noticed at an early age and may become more noticeable when a child's circumstances change, such as when they start school. Most cases are diagnosed when children...

What are adenoids? Adenoids are small lumps of tissue at the back of the nose, above the roof of the mouth. You can't see a person's adenoids by looking in their mouth. Adenoids are part of the immune system, which helps fight infection and protects the body from bacteria and...

Overview Addison’s disease (also known as primary adrenal insufficiency or hypoadrenalism) is a rare disorder of the adrenal glands. The adrenal glands are two small glands that sit on top of the kidneys. They produce two essential hormones: cortisol and aldosterone. In Addison's disease, the adrenal gland is damaged, and...

Cardiomyopathy is a general term for diseases of the heart muscle, where the walls of the heart chambers have become stretched, thickened or stiff. This affects the heart's ability to pump blood around the body. Some types of cardiomyopathy are inherited and are seen in children and younger people. Dilated cardiomyopathy...