For many people who suffer from mental-health disorders—especially those who experience anxiety—insomnia often goes hand-in-hand with a diagnosis.

Many childhood anxiety disorders surface around age 5. This is a time of major transition for most children. As they enter kindergarten, they must learn to cope with new social situations and academic pressure.

Lexapro, the brand name of a prescription selective serotonin reuptake inhibitor, or SSRI is used to treat depression and anxiety. Lexapro, like any SSRI medication, can cause serious withdrawal effects when discontinuing the medication too abruptly.

Even the most laid-back people sometimes experience anxiety. While occasional anxiety is a normal experience, frequent anxiety may signal a mental or physical disorder. Anxiety originates in your brain but triggers many physical responses.

Anxiety--the way your body reacts to dangerous situations--is a normal biological function. However, when your anxiety response occurs even when there is no specific threat, it can become an anxiety disorder. Symptoms of anxiety include muscle tension, restlessness, insomnia, stomach pains, and excessive sweating.

Anxiety developed from the natural process of fight or flight. Anxiety used to tell us when a situation became dangerous, and it increased our abilities to fight off the danger or reduce it by getting away.

Everyone experiences anxiety during times of stress, and our bodies are able to cope with this. Some people, however, experience anxiety during times that are not stressful and have no control over how their bodies are reacting to events that should not produce such responses.

Valerian root is an herb that is commonly used for many conditions, such as insomnia, anxiety, headaches and upset stomach. It can be used alone or in combination with other herbs.

According to the National Institutes of Health (NIH), a rapid pulse or arrhythmia may occur during episodes of anxiety. A normal pulse or heart rate is between 60-100 beats per minute.

The amino acid derivative L-theanine, also known as Y-glutamylcthylamide, is found naturally almost exclusively in tea leaves. It is able to cross the blood-brain barrier and is considered to be psychoactive.

Lexapro, the brand name for escitalopram, and Celexa, the brand name for citalopram, are very similar in many ways. But the 2 drugs are not interchangeable. They differ in chemical structure, uses, effectiveness and some side effects.

Creatine, a naturally occurring amino acid found in the body, is also one of the most popular supplements among competitive athletes and bodybuilders. Aside from creatine being consumed to improve athletic performance, it has also been used to treat cardiovascular disease, Parkinson's disease and muscular dystrophy.