Adjustment disorder is a maladaptive response to a psychosocial stressor. It is classified as a mental disorder. The maladaptive response usually involves otherwise normal emotional and behavioral reactions that manifest more intensely than usual (considering contextual and cultural factors), causing marked distress, preoccupation with the stressor and its consequences, and functional impairment. Diagnosis of adjustment disorder is common. Lifetime prevalence estimates for adults range from five percent to 21%. Adult women are diagnosed twice as often as men. Among children and adolescents, girls and boys are equally likely to be diagnosed with an adjustment disorder. Adjustment disorder was introduced into the Diagnostic and Statistical Manual of Mental Disorders in 1980 (DSM-III). Other names for adjustment disorder are stress response syndrome (new name as of 2013) and situational depression since it is one of the most common symptoms. Signs and symptoms Some emotional signs of adjustment disorder are: sadness, hopelessness, lack of enjoyment, crying spells, nervousness, anxiety, desperation, feeling overwhelmed and thoughts of suicide, performing poorly in school/work etc. Common characteristics of adjustment disorder include mild depressive symptoms, anxiety symptoms, and traumatic stress symptoms or a combination of the three. According to the DSM-5, there are six types of adjustment disorder, which are characterized by the following predominant symptoms: depressed mood, anxiety, mixed depression and anxiety, disturbance of conduct, mixed disturbance of emotions and conduct, and unspecified. However, the criteria for these symptoms are not specified in greater detail. Adjustment disorder may be acute or chronic, depending on whether it lasts more or less than six months. According to the DSM-5, if the adjustment disorder lasts less than six months, then it may be considered acute. If it lasts more than six months, it may be considered chronic. Moreover, the symptoms cannot last longer than six months after the stressor(s), or its consequences, have terminated. However, the stress-related disturbance does not only exist as an exacerbation of a pre-existing mental disorder. Unlike major depression, the disorder is caused by an outside stressor and generally resolves once the individual is able to adapt to the situation. The condition is different from anxiety disorder, which lacks the presence of a stressor, or post-traumatic stress disorder and acute stress disorder, which usually are associated with a more intense stressor. Suicidal behavior is prominent among people with adjustment disorder of all ages, and up to one-fifth of adolescent suicide victims may have an adjustment disorder.