Internet addiction is now considered a serious public health issue and clinical disorder by some experts. Heavy internet users can experience withdrawal symptoms when unable to access the internet, including feelings of anger and depression. A case study from South Korea found some internet addicts dropping out of school or quitting jobs to spend more time online. Self-help groups have emerged both online and offline to help people wean themselves off excessive internet use. While internet addiction is difficult to define and measure, some psychiatrists believe it should be officially recognized due to its negative impacts and high relapse rates among those treated.