Table 1: DSM-5 IGD-Internet gaming disorder.

The Internet began to spread in the latter half of the 1990s, its history is still shallow. However, in the United States, it has been reported about Internet addiction in 1998. In 2003, also in Korea, Internet subscribers to the population of one million people became the number one in the world and the number of young people immersed in online games has increased rapidly. According to Korea’s statistics in 2009, 12.8% of young people and 6.4% of adults were reported to be Internet addiction [3]. In the Norwegian survey, it was reported that males were more likely to depend on the Internet at the ages of 16 to 29 [4], and survey in China, middle to high school and university students aged 10 to 24, men showed 10.4%, women reported 5.9% respectively [5]. Although the Internet addiction tends to be relatively large in the young generation, since there are large variations, it is only necessary to have a unified manual for diagnosing the Internet addiction, but it seems that there is no such a manual.

DSM-5, which is a de facto international manual, is often used as a diagnostic criterion for Internet addiction, but it is not made by referring to Internet addiction. Internet addiction patients do not mean those who do nothing but online games. Those who are continuing to watch videos, those who are surfing the Internet, those who are building human relationships via SNS etc., and those who use gambling or pornographic sites. There are such various types of Internet addiction patients, but classically they are classified into five types by Young et al. That is,

SCC is a malignancy of epithelial origin capable of occurring in ogans that are covered with squamous epithelium. Non-melanoma skin cancer, head and neck cancer, esophageal cancer and nonsmall cell lung cancer account for majority of cases [23]. SCC as a variant of GC is an unusual histological subtype and rare. May occur as primary SCC, adenosquamous carcinoma or as collision tumour of the stomach [2-6]. However, there was no histological evidence of either squamous differentiation of the gastric antral tumour or a primary site of SCC in the resected specimen. Synchronous SCC of the oesophagus and adenocarcinoma of the stomach has also been documented in the literature and primary SCC of the esophagus has been shown to metastasize to perigastric LN [24,25]. However, preoperative and follow-up EGD in this patient did not revealed any pathology in the esophagus and he is completely asymptomatic two years after surgery.

a) Cybersexual addiction,

b) Cyber-relational addiction,

c) net compulsions,

d) Information overload,

e) Computer addiction [6].

However, the advancement of the Internet technology is fast, there is a possibility that a new type of Internet addiction patient will appear in the future. Since it seems that some parts cannot be dealt with by classical classification, we are forced to negotiate the urgent need to formulate guidelines specialized for Internet addiction.

Although Internet addiction often matches other dependencies such as health problems, monetary economic problems, mental problems such as human relations, it contains essentially different problems. In the case of online game dependence as an example, since Internet use from midnight to dawn is the most frequent, sleep disturbance is caused almost certainly due to insufficient sleep. The most problematic thing in this sleep disorder is depression. In the case of a student, problems such as poor academic achievement, late arrival, absence, failure to go to school and other problems arise and even in subsequent life, it will have a great impact. In addition, from a viewpoint of dependence in a broad sense, it is reported that neurocyte damage in the human brain, such as alcoholism, can be seen in Internet dependent patients [7,8].

In modern society, the Internet is an indispensable tool to our daily lives, and new services will be born through the Internet for the development of the technology in the future. However, because it is a convenient tool, there is a tendency to immerse people too much and depend heavily on it. Sleep disorder is inevitable in the Internet addiction, and the economic loss caused by sleep disorder is said to be 5 trillion yen [9]. It is urgently desirable to define and diagnose Internet addiction and formulate guidelines for treatment

1. Mitchell P (2000) Internet addiction: genuine diagnosis or not? Lancet 355(9204): 632.
2. (2013) Diagnostic and Statistical Manual of Mental Disorder, (5th Edn.), DSM-5. American Psychiatric Association, Washington DC, USA.
3. (2010) Korea National Information Society Agency: 2010 Informatization White Paper.
4. Bakken IJ, Wenzel HG, Götestam KG, Johansson A, Oren A (2009) Internet addiction among Norwegian adults: a stratified probability sample study. Scand J Psychol 50(2): 121-127.
5. Cao H, Sun Y, Wan Y, Hao J, Tao F (2011) Problematic Internet use in Chinese adolescents and its relation to phychosomatic symptoms and life satisfaction. BMC Public Health 14(11): 802.
6. Young K, Pistner M, O’Mara J, Buchanan J (1999) Cyber disorders: the mental health concern for the new millenium. Cyberpsychol Behav 2(5): 475-479.
7. Yuan K, Qin W, Wang G (2011) Microstructure abnormalities in adolescents with internet disorder. PLoS One 6(6): e20708.
8. Zhou Y, Lin FC, Du YS (2011) Gray matter abnormalities in internet addiction: a voxel-based morphometry study. Eur J Radiol 79(1): 92-95.
9. (1993) National Commission on Sleep Disorders Research (US). Wake up America: a national sleep alert: report of the National Commission on Sleep Disorders Research.