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Encephalopathy refers to brain disease, damage, or malfunction. Learn about what causes encephalopathy as well as types, symptoms, stages, and treatment.

Drug abuse and addiction is a chronic disease that causes drug-seeking behavior and drug use despite negative consequences to the user and those around him. Though the initial decision to use drugs is voluntary, changes in the brain caused by repeated drug abuse can affect a person's self-control and ability to make the right decisions and increase the urge to take drugs. Drug abuse and addiction are preventable.

Attention deficit hyperactivity disorder (ADHD) causes the following symptoms in children: excessive activity, problems concentrating, and difficulty controlling impulses. Stimulant medications are the most common medication used to treat ADHD.

About 2%-6% of adults have ADHD, a common behavioral problem. Symptoms include impulsivity, hyperactivity, and inattention. Treatment may involve ADHD education, attending a support group, skills training, and medication.

ADHD is a behavioral condition with characteristics that include hyperactivity, inattention, and impulsivity. Parenting a child with ADHD presents a variety of challenges. Treatment options for children with ADHD include medication and behavioral therapy.

The causes of narcolepsy, a chronic disease of the central nervous system, have not been fully determined. Some theories include abnormalities in hypocretin neurons in the brain or an autoimmune disorder. Symptoms of narcolepsy include excessive daytime sleepiness, sleep paralysis, cataplexy, hypnagogic hallucinations, disturbed nocturnal sleep, and automatic behavior. Diagnosis of narcolepsy is based on a clinical evaluation, specific questionnaires, sleep logs or diaries, and the results of sleep laboratory tests. Treatments of narcolepsy symptoms include medication and lifestyle changes.

Attention deficit hyperactivity disorder (ADHD) in teens is a disruption of neurocognitive functioning. Genetics contribute to ADHD. Symptoms of ADHD in teens include inattention, hyperactivity/impulsivity, or a combination of these. Treatment may include cognitive behavioral therapy, behavior therapy, medication, or alternative therapies.

Misophonia is defined as the hatred of sound. Symptoms of this condition include a negative emotional response to certain trigger sounds, such as slurping, snoring, yawning, or throat clearing. Other symptoms include distancing oneself from the trigger, and acting out at the sound's source. Treatment may involve medications, cognitive behavioral therapy, or tinnitus retraining therapy.

The exact cause of Tourette syndrome isn't known. It is likely to be caused by an interplay between genetic and environmental factors such as certain infections. Recent research on Tourette syndrome has found problems in certain brain regions and neurotransmitters (dopamine, serotonin and norepinephrine) that transmit messages between the nerve cells. These abnormalities may be responsible for the symptoms in Tourette syndrome.