Main Systems of Classification   * The system ICD (international classification of diseases).   * The APA ( American Psychiatric Association) system.   * Other classifications, for example the Chinese classification of mental disorders and psycho dynamic manual. ICD (international classification of diseases) produced by the World Health Organization. American Psychiatric Association: in a diagnostic manual known as Diagnostic and statistical Manual of Mental Disorders. Other classifications mostly used locally. The Diagnostic Statistical Manual (DSM) Usage   * Mental disorder physicians;   * Agencies that regulate psychiatric drugs;   * Researchers;   * Pharmaceutical companies;   * Health insurance companies. Classification was first developed for reasons of data collection about mental illness in the US. It then developed further with various changes over the years until it is currently known as DSM IV. DSM IV   * Disorders listed as prototypes.   * Others grouped as non criterion, isolated and low-grade.   * Symptoms are sufficient to cause a disorder.   * Qualifiers: mild, severe and moderate.   * Disorders can be identified by codes. The system organizes mental health diagnosis into five axes.   * Axis I – Clinical, developmental and learning disorders (anxiety disorders, mood disorders, depression, bipolar disorders, phobias, schizophrenia and ADHD).   * Axis II – Personality disorders, persuasive conditions and mental retardation conditions.   * Axis III – Physical disorders and acute medical conditions (injuries to the brain, disorders that may trigger other diseases or disorders).   * Axis IV – Factors contributing to the disorders, e.g. psychological and environmental factors.   * Axis V – Assessment scale for children below the age of 18 and is used globally. Anxiety Disorders   * Emotional state always accompanied by exhaustion or fatigue;   * Belong to axis I in DSM-IV classification;   * Different types;   * Diagnosis dependent on the type of disorder it is. Types of anxiety disorders are: panic disorder, agoraphobia, generalized anxiety disorder, social anxiety disorder, separation anxiety, phobias, obsessive and compulsive disorder and post traumatic stress disorder. The main cause of anxiety disorders is the lack of coordination between the amygdala that and the parabranchial nucleus in the brain. Low levels of the neurotransmitter, GABA, in the regulation of activity in the central nervous system therefore over activity and anxiety. Common symptoms that often accompany anxiety are: Chronic, overstated worry, stress, and irritability that either causeless or in larger form than the situation requires. The physical symptoms, such as impatience, sleep troubles, trembling, headaches, overall tension in muscles, or sweating. Treatment: Cognitive behavioral therapy, relaxation techniques, and biofeedback to control muscle tension. Medication in general include anti-anxiety drugs. Somatoform Disorders   * Characterized by physical symptoms.   * The severity of the disorder and time span is affected by psychological factors.   * Recognized by the DSM-IV as of six types. No identifiable cause of the physical symptoms – a mental disorder. The physical symptoms can cause distress, disturb the functions of the patient socially and occupationally. Types: The somatization disorder, hypochondriasis, the body dysmorphic disorder, pain disorder, conversion disorde