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Hikikomori

Hikikomori is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Hikikomori rather than just read about it. In short: Hikikomori (Japanese: 引きこもり or ひきこもり [çi̥kʲikomoɾʲi], lit. 'pulling inward, being confined') are reclusive adolescents or adults who withdraw from social life, often seeking extreme degrees of isolation and confinement. The term refers to both the sociological phenomenon in general and the individuals belonging to this societal group, who have been described as "modern hermits".

Hikikomori — main illustration
Hikikomori — illustration

Key takeaways

  • Hikikomori belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Hikikomori to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Hikikomori from memory before moving on to harder problems.

Reference excerpt

Hikikomori (Japanese: 引きこもり or ひきこもり [çi̥kʲikomoɾʲi], lit. 'pulling inward, being confined') are reclusive adolescents or adults who withdraw from social life, often seeking extreme degrees of isolation and confinement. The term refers to both the sociological phenomenon in general and the individuals belonging to this societal group, who have been described as "modern hermits". Hikikomori has been an increasing problem in Japan since the 1990s, with estimates suggesting that over a million individuals are affected. While the phenomenon is most associated with Japan, cases with similar conditions have also been reported in other parts of the world. The key characteristics of hikikomori include a marked avoidance of social situations and interaction, a retreat into one's home (often a single room) for at least six months, and significant functional impairment or distress. While not a formal psychiatric diagnosis in itself, hikikomori can co-occur with various mental health conditions such as depression, anxiety disorders, or developmental disorders. The etiology is complex and multifaceted, involving individual psychological vulnerabilities (such as a history of bullying or academic failure, and personality traits like introversion or high sensitivity to shame), familial dynamics (including parent-child relationships and communication issues), and broader societal pressures related to education, employment, and social expectations in contemporary societies. The understanding and societal response to hikikomori have evolved, with various support systems and treatment approaches being explored. The issue raises significant concerns regarding individual well-being, family burden, and the social integration of a considerable segment of the population.

Etymology and definition The Japanese term hikikomori (引きこもり or ひきこもり) is composed of the verbs hiku (引く, "to pull, draw, retreat") and komoru (籠る, "to shut oneself up, stay inside"). It describes both the condition of severe social withdrawal and the individuals who experience it. Psychiatrist Tamaki Saitō, who extensively researched and popularized the term with his 1998 book Shakaiteki Hikikomori: Owaranai Shishunki (Social Hikikomori: Adolescence without End), provided an early influential definition:

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. Saitō's initial definition emphasized hikikomori as a primary form of social withdrawal, distinct from other mental illnesses, although he later acknowledged that psychiatric treatment might be necessary. The Japanese Ministry of Health, Labour and Welfare (MHLW) in its 2003 guideline (updated in 2010) described hikikomori as a "psycho-sociological phenomenon" rather than a single disease entity, characterized by withdrawal from social participation (school, work, interactions outside home) and staying at home for more than six months, typically affecting individuals under 30. The MHLW guidelines also noted that while hikikomori is principally a non-psychotic phenomenon, it may co-occur with conditions like schizophrenia. A more recent consensus among psychiatrists, as summarized by Kato, Kanba & Teo (2020), defines hikikomori as:

a form of pathological social withdrawal or social isolation whose essential feature is physical isolation in one's home. The person must meet the following criteria: a) marked social isolation in one's home; b) duration of continuous social isolation of at least 6 months; c) significant functional impairment or distress associated with the social isolation. This definition explicitly recognizes that hikikomori can co-occur with other mental disorders, differing from Saitō's earlier emphasis on it as a primary condition. The term is used to describe both the phenomenon and the individuals affected by it.

Characteristics The primary characteristic of hikikomori is a state of severe social withdrawal where individuals confine themselves to their homes, often to a single room, for extended periods, typically six months or longer. This isolation involves a marked avoidance of social participation, such as attending school or work, and a reluctance to engage in social interactions even with family members. Common behavioral patterns include a reversal of sleep-wake cycles (sleeping during the day and being active at night), excessive time spent on solitary activities like using the internet, playing video games, or watching television, and sometimes neglecting personal hygiene. While some may occasionally leave home for specific purposes, such as visiting a convenience store, their overall social engagement remains extremely limited. Some hikikomori individuals may also exhibit aggressive or violent behavior within the household, though this is not a universal characteristic. Psychologically, individuals in hikikomori often experience significant distress. This can manifest as feelings of shame, inadequacy, anxiety, depression, and a profound sense of apathy or loss of motivation. Fear of others (anthropophobia) and obsessive-compulsive tendencies can also accompany the withdrawal. Saitō noted that many cases involve individuals who were initially perceived as "good" or introverted children who did not go through a typical rebellious phase. However, he also emphasized that there is not one fixed personality trait that manifests in every case. The experience often involves a loss of connection with the future, as described by Kazuki Ueyama: "The present was everything. I didn't have the ability to think about the future". The phenomenon predominantly affects males, with Saitō reporting that 80% of the cases he dealt with were men. Government surveys also indicate a higher prevalence in males, for example, the 2016 Cabinet Office survey found 63.3% of hikikomori aged 15–39 were men, and the 2019 survey for those aged 40–64 found 76.6% were men. While often associated with adolescents and young adults, with onset typically occurring in the mid-teens to late twenties, hikikomori can persist for many years, leading to an aging population of individuals in withdrawal, sometimes referred to as the "80-50 problem" (parents in their 80s caring for hikikomori children in their 50s).

… excerpt ends here. Continue reading the full article.

Illustrations

Hikikomori: A young Japanese man living as a hikikomori in 2004
A young Japanese man living as a hikikomori in 2004
Hikikomori: Japanese high school classroom. Rigid education is often cited as a contributing factor to hikikomori.
Japanese high school classroom. Rigid education is often cited as a contributing factor to hikikomori.
Hikikomori: A residential street in Tokyo
A residential street in Tokyo

Worked examples

Example 1 — a first encounter with Hikikomori

Start with the simplest possible case. Write down what Hikikomori claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Hikikomori before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Hikikomori ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Hikikomori

In research
Hikikomori appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Hikikomori in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Hikikomori is common in secondary-school and first-year university syllabi. It links to neighbouring topics Anxiety disorders, Culture-bound syndromes, Depression (mood), so understanding it makes those chapters shorter.
In everyday life
Look for Hikikomori outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Hikikomori in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Hikikomori means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Hikikomori out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hikikomori in simple terms?

Hikikomori (Japanese: 引きこもり or ひきこもり [çi̥kʲikomoɾʲi], lit. 'pulling inward, being confined') are reclusive adolescents or adults who withdraw from social life, often seeking extreme degrees of isolation and confinement. The term refers to both the sociological phenomenon in general and the individu…

Why does Hikikomori matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Hikikomori?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hikikomori.

Tags

  • Anxiety disorders
  • Culture-bound syndromes
  • Depression (mood)
  • Japanese words and phrases
  • Mental disorders
  • Psychological adjustment
  • Social issues in Japan
  • Social phenomena
  • Society of Japan
  • Youth in Japan

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