In Japan, hikikomori (Japanese: ひきこもり or 引き籠り, lit. "pulling inward, being confined", i.e., "acute social withdrawal") are reclusive adolescents or adults who withdraw from social life, often seeking extreme degrees of isolation and confinement. Hikikomori refers to both the phenomenon in general and the recluses themselves. Hikikomori have been described as loners or "modern-day hermits". Estimates reveal that nearly half a million Japanese youth have become social recluses. 
The Japanese Ministry of Health, Labour, and Welfare defines hikikomori as a condition in which the affected individuals isolate themselves from society in their homes for a period exceeding six months. The psychiatrist Tamaki Saitō defines hikikomori as "a state that has become a problem by the late twenties, that involves cooping oneself up in one's own home and not participating in society for six months or longer, but that does not seem to have another psychological problem as its principal source".
More recently, researchers have developed more specific criteria to more accurately identify hikikomori. During a diagnostic interview, trained clinicians evaluate for:
- spending most of the day and nearly every day confined to home,
- marked and persistent avoidance of social situations,
- social withdrawal symptoms causing significant functional impairment,
- duration of at least six months, and
- no apparent physical etiology to account for the social withdrawal symptoms.
The psychiatrist Alan Teo first characterized hikikomori in Japan as modern-day hermits, while the literary and communication scholar Flavio Rizzo similarly described hikikomori as "post-modern hermits" whose solitude stems from ancestral desires for withdrawal.
While the degree of the phenomenon varies on an individual basis, in the most extreme cases, some people remain in isolation for years or even decades. Often hikikomori start out as school refusals, or futōkō (不登校) in Japanese (an older term is tōkōkyohi (登校拒否)).
While many people feel the pressures of the outside world, hikikomori react by complete social withdrawal. In some cases, they isolate themselves in their living quarters for prolonged periods, sometimes for years. They usually have few or no friends. In interviews with current or recovering hikikomori, media reports and documentaries have captured the strong levels of psychological distress and angst felt by these individuals.
While hikikomori favour indoor activities, some venture outdoors occasionally. The withdrawal from society usually starts gradually. Affected people may appear unhappy, lose their friends, become insecure, shy, and talk less.
According to government figures released in 2010, there are 700,000 individuals living as hikikomori with an average age of 31. Still, the numbers vary widely between experts. Among these are the hikikomori that are now in their 40s and have spent 20 years in isolation, this group is generally referred to as the "first-generation hikikomori", and there is concern about their reintegration into society in what is known as "the 2030 Problem", when they are in their 60s and their parents begin to die. Additionally, the government estimates that 1.55 million people are on the verge of becoming hikikomori. Tamaki Saitō, who first coined the phrase, originally estimated that there may be over one million hikikomori in Japan, though this was not based on national survey data. Nonetheless, considering that hikikomori adolescents are hidden away and their parents are often reluctant to talk about the problem, it is extremely difficult to gauge the number accurately.
While hikikomori is mostly a Japanese phenomenon, cases have been found in the United States, Morocco, Oman, Spain, Italy, South Korea and France. Recent research using the same standardized definition of hikikomori has found evidence of it existing in other countries as wide-ranging as the United States and India.
Hypotheses on cause
Hikikomori is similar to the social withdrawal exhibited by some people with autism spectrum disorders, a group of disorders that include Asperger syndrome, PDD-NOS and "classic" autism. This has led some psychiatrists to suggest that hikikomori may be affected by autism spectrum disorders and other disorders that affect social integration, but that their disorders are altered from their typical Western presentation because of the social and cultural pressures unique to Japan. Suwa & Hara (2007) discovered that 5 of 27 cases of hikikomori had a high-functioning pervasive developmental disorder (HPDD), and 12 more had other disorders or mental diseases (6 cases of personality disorders, 3 cases of obsessive-compulsive disorder, 2 cases of depression, 1 case of slight mental retardation). The researchers used a vignette to illustrate the difference between primary hikikomori (without any obvious mental disorder) and hikikomori with HPDD or other disorder; furthermore, 10 out of 27 had primary hikikomori. Alan Teo and colleagues conducted detailed diagnostic evaluations of 22 individuals with hikikomori and found that while the majority of cases fulfilled criteria for multiple psychiatric conditions, about 1 in 5 cases were primary hikikomori.
According to Michael Zielenziger's book, Shutting Out the Sun: How Japan Created Its Own Lost Generation, the syndrome is more closely related to posttraumatic stress disorder. The author claimed that the hikikomori interviewed for the book had discovered independent thinking and a sense of self that the current Japanese environment could not accommodate.
Social and cultural influence
Sometimes referred to as a social problem in Japanese discourse, hikikomori has a number of possible contributing factors. Alan Teo has summarized a number of potential cultural features that may contribute to its predominance in Japan, including tendencies toward conformity and collectivism, overprotective parenting and particularities of the educational and economic systems.
Though acute social withdrawal in Japan appears to affect both genders equally, because of differing social expectations for maturing boys and girls, the most widely reported cases of hikikomori are from middle- and upper-middle-class families whose sons, typically their eldest, refuse to leave the home, often after experiencing one or more traumatic episodes of social or academic failure.
In The Anatomy of Dependence, Takeo Doi identifies the symptoms of hikikomori, and explains its prevalence as originating in the Japanese psychological construct of amae (in Freudian terms, "passive object love", typically of the kind between mother and infant). Other Japanese commentators such as academic Shinji Miyadai and novelist Ryū Murakami, have also offered analysis of the hikikomori phenomenon, and find distinct causal relationships with the modern Japanese social conditions of anomie, amae and atrophying paternal influence in nuclear family child pedagogy. Young adults may feel overwhelmed by modern Japanese society, or be unable to fulfill their expected social roles as they have not yet formulated a sense of personal honne and tatemae – one's "true self" and one's "public façade" – necessary to cope with the paradoxes of adulthood.
The dominant nexus of hikikomori centres on the transformation from youth to the responsibilities and expectations of adult life. Indications are that advanced industrialized societies such as modern Japan fail to provide sufficient meaningful transformation rituals for promoting certain susceptible types of youth into mature roles. As do many societies, Japan exerts a great deal of pressure on adolescents to be successful and perpetuate the existing social status quo. A traditionally strong emphasis on complex social conduct, rigid hierarchies and the resulting, potentially intimidating multitude of social expectations, responsibilities and duties in Japanese society contribute to this pressure on young adults. Historically, Confucian teachings de-emphasizing the individual and favouring a conformist stance to ensure social harmony in a rigidly hierarchized society have shaped much of East Asia, possibly explaining the emergence of the hikikomori phenomenon in other East Asian countries.
In general, the prevalence of hikikomori tendencies in Japan may be encouraged and facilitated by three primary factors:
- Middle class affluence in a post-industrial society such as Japan allows parents to support and feed an adult child in the home indefinitely. Lower-income families do not have hikikomori children because a socially withdrawing youth is forced to work outside the home.
- The inability of Japanese parents to recognize and act upon the youth's slide into isolation; soft parenting; or codependence between mother and son, known as amae in Japanese.
- A decade of flat economic indicators and a shaky job market in Japan makes the pre-existing system requiring years of competitive schooling for elite jobs appear like a pointless effort to many. While Japanese fathers of the current generation of youth still enjoy lifetime employment at multinational corporations, incoming employees in Japan enjoy no such guarantees in today's job market. Some younger Japanese people begin to suspect that the system put in place for their grandfathers and fathers no longer works, and for some, the lack of a clear life goal makes them susceptible to social withdrawal as a hikikomori.
Japanese education system
The Japanese education system, like those found in China, Singapore and South Korea, puts great demands upon youth. A multitude of expectations, high emphasis on competition, and the rote memorization of facts and figures for the purpose of passing entrance exams into the next tier of education in what could be termed a rigid pass-or-fail ideology, induce a high level of stress. Echoing the traditional Confucian values of society, the educational system is still viewed as playing an important part in society's overall productivity and success.
In this social frame, students often face significant pressure from parents and the society in general to conform to its dictates and doctrines. These doctrines, while part of modern Japanese society, are increasingly being rejected by Japanese youth in varying ways such as hikikomori, freeter, NEET (Not currently engaged in Employment, Education, or Training), and parasite singles. The term "Hodo-Hodo zoku" (the "So-So tribe") applies to younger workers who refuse promotion to minimize stress and maximize free time.
Beginning in the 1960s, the pressure on Japanese youth to succeed began successively earlier in their lives, sometimes starting before pre-school, where even toddlers had to compete through an entrance exam for the privilege of attending one of the best pre-schools. This was said to prepare children for the entrance exam of the best kindergarten, which in turn prepared the child for the entrance exam of the best elementary school, junior high school, high school, and eventually for their university entrance exam. Many adolescents take one year off after high school to study exclusively for the university entrance exam, and are known as ronin. More prestigious universities have more difficult exams. The most prestigious university with the most difficult exam is the University of Tokyo.
Since 1996, the Japanese Ministry of Education has taken steps to address this 'pressure-cooker' educational environment and instill greater creative thought in Japanese youth by significantly relaxing the school schedule from six-day weeks to five-day weeks and dropping two subjects from the daily schedule, with new academic curricula more comparable to Western educational models. However, Japanese parents are sending their children to private cram schools, known as juku, to 'make up' for lost time.
After graduating from high school or university, Japanese youth also have to face a very difficult job market in Japan, often finding only part-time employment and ending up as freeters with little income, unable to start a family.
Another source of pressure is from their co-students, who may harass and bully (ijime) some students for a variety of reasons, including physical appearance, wealth, or educational or athletic performance. Some have been punished for bullying or truancy, bringing shame to their families. Refusal to participate in society makes hikikomori an extreme subset of a much larger group of younger Japanese that includes parasite singles and freeters.
Japanese financial crisis
Some organizations such as the non-profit Japanese organization NPO lila have been trying to combat the financial burden the hikikomori phenomenon has had on Japan's economy. The Japanese CD and DVD producer Avex Group produces DVD videos of live-action women staring into a camera to help hikikomori learn to cope with eye contact and long spans of human interaction. The goal is to help hikikomori reintegrate into society by personal choice, thereby realizing an economic contribution and reducing the financial burden on parents.
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