Autism is a developmental disorder that begins early in childhood. Symptoms vary for each person, as does the severity of symptoms. Hyperactivity is one symptom associated with this condition.

Stress is a typical part of life. You may feel stressed when a situation doesn't turn out the way you intended. A bad test grade, marital problems, getting fired and breaking up with a significant other are all typical situations in which you may experience stress.

Anxiety is a relatively common mental health disorder. According to the National Institute of Mental Health, 40 million American adults are affected by anxiety disorders each year.

Depression is a debilitating mental illness that affects people socially and occupationally. Symptoms of depression include feelings of sadness and irritability, thoughts of suicide, issues with eating and sleeping, trouble concentrating and fatigue.

Nearly 1 in 5 U.S. adults are dealing with an anxiety disorder in any given year, according to the National Institute of Mental Health. Antianxiety medications are sometimes used as a component of anxiety disorder treatment.

Drug overdose occurs when an amount of drug in excess of the recommended dose is ingested. Overdose can be intentional, but it can also happen accidentally as a result of other drug and/or alcohol interactions. Overdosing on Lexapro, a drug for depression, can lead to serious complications.

According to the American Institute of Stress, stress has many different causes, which can vary from person to person. A situation or condition that bothers one person might not worry another person at all.

Soy, or soya, lecithin is a gluten-free food because it is not made from wheat, rye or barley. While soy lecithin by itself does not contain gluten, additives to lecithin may contain gluten. Consumers must do their own research into ingredients and gluten content, which can sometimes be confusing.

Anxiety if a psychological condition that can cause physical signs and symptoms. Although anxiety is a normal response to stress, it can become difficult to deal with, especially if it interferes with daily functioning. If you suffer from anxiety, you may feel tired, overwhelmed, restless and irritable.

Mental illness is a disease that alters an individual’s ability to cope with everyday challenges. It affects the individual’s thought process and behavior. Some early warnings signs of mental illness may include changes in mood, personality, personal habits, motivation, concentration or social skills.

When faced with a stressful situation, the human body responds with the fight-or-flight response. The sympathetic nervous system reacts, resulting in symptoms such as a racing heart beat and increased sweating. After the stress goes away, the parasympathetic nervous system activates, returning the body to normal.

Attention-deficit/hyperactivity disorder, sometimes referred to as ADHD or ADD, was once considered a childhood and adolescent disorder that people grew out of as they aged into adulthood.