The article reviews the literature on internet addiction, focusing on diagnosis, phenomenology, epidemiology, and treatment. Internet addiction is characterized by excessive or poorly controlled preoccupations, urges, or behaviors regarding computer use and Internet access, leading to impairment or distress. However, it is not currently recognized as an official diagnostic disorder in the DSM. The prevalence of internet addiction ranges from 1.5% to 8.2% in surveys in the United States and Europe, with high comorbidity with psychiatric disorders such as affective disorders, anxiety disorders, and ADHD. Factors predictive of problematic internet use include personality traits, parenting and familial factors, alcohol use, and social anxiety. Neurobiological studies suggest similarities between internet addiction and substance dependence, particularly in the activation of certain brain regions. Genetic factors, such as polymorphisms in the serotonin transporter gene, also play a role. Treatment options are limited, with psychosocial approaches being the mainstay, but there is a need for more research to develop evidence-based treatments.The article reviews the literature on internet addiction, focusing on diagnosis, phenomenology, epidemiology, and treatment. Internet addiction is characterized by excessive or poorly controlled preoccupations, urges, or behaviors regarding computer use and Internet access, leading to impairment or distress. However, it is not currently recognized as an official diagnostic disorder in the DSM. The prevalence of internet addiction ranges from 1.5% to 8.2% in surveys in the United States and Europe, with high comorbidity with psychiatric disorders such as affective disorders, anxiety disorders, and ADHD. Factors predictive of problematic internet use include personality traits, parenting and familial factors, alcohol use, and social anxiety. Neurobiological studies suggest similarities between internet addiction and substance dependence, particularly in the activation of certain brain regions. Genetic factors, such as polymorphisms in the serotonin transporter gene, also play a role. Treatment options are limited, with psychosocial approaches being the mainstay, but there is a need for more research to develop evidence-based treatments.