Anxiety is described as a general feeling of worry, according to the University of Maryland Medical Center.

Autism is a developmental disorder that impairs social and communication skills. Autistic children can learn the alphabet and numbers, but it helps if teachers work with their learning styles. Understanding how this population learns will help you teach autistic children better.

Bipolar disorder, also known as manic-depressive disorder, refers to a group of mood disorders that varies in the severity of episodes of mania and depression and the predominant type of episode. Certain chemicals, also called neurotransmitters, act as messengers between neurons in the brain.

Panic attacks, a type of anxiety disorder, involve episodes of extreme anxiety or terror out of proportion to any actual threat.

Sociopathy is categorized as a personality disorder characteristic under the broader diagnosis of anti-social personality disorder.

Serotonin, also called 5-hydroxytryptamine (5-HT), is a neurotransmitter, a chemical required for the healthy functioning of your brain cells, nerves and gastrointestinal tract.

Ritalin, also sold under the generic name methylphenidate, is a central nervous system (CNS) stimulant used to treat attention deficit-hyperactivity disorder (ADHD). While the drug is effective in treating inattention symptoms of ADHD, using Ritalin can result in mental and emotional changes in the patient.

Tourette’s Syndrome is a neurological disorder named for a French neurologist who described the condition in 1885. The disorder causes tics, which are involuntary movements, speech and sounds. Males are more likely to have Tourette than females and the condition affects all ethnic groups.

When ADHD symptoms overlap with conditions such as bipolar disorder, it is difficult to distinguish between disorders. The National Comorbidity Survey showed that attention-deficit/hyperactivity disorder or ADHD exist together in 21.

Autism is a developmental disorder that affects communication, relationships and behavior. Although researchers have found evidence that autism begins before birth, and signs appear during infancy as the young person matures, the challenges of adolescence can cause new signs to emerge.

Boils, also called risens and furuncles, are round, raised bumps on the skin filled with puss and caused by a Staphylococcus bacteria infection. Boils often develop around a hair follicle root, and often occur in children and adolescents, although adults can also get them.

Generalized anxiety disorder consists of excessive worry about many issues combined with an inability to control that worry. Other symptoms include sleep disturbance, restlessness, irritability and being easily fatigued. Genes seem to play a role, as do stressful events and learned behavior.