The was invented during 1936-1938, long before an international headache classification existed. The of the International Headache Classification was published in 1988. The that went online was published in 1990 almost at the same time. While ICHD-1 did not become available digitally, the was launched for the first time in 2006. In recent years, there has been a tremendous advance of digital media in medicine. The use of mobile smartphones and tablets has become a standard in all areas of medicine. Many different operating systems and display formats are available. For ICHD-3 beta, we have chosen a platform that responsively adjusts to the different devices and display formats. The web address can be directly added to the home screen of the particular device and thereby opened and used just like a native app. The links demonstrate, how digital ICHD-3 beta can be added to or home screen. The website also provides a “”, a one-tap solution for reading web pages formatted for easy reading. After loading the ICHD-3 beta website page in the Safari browser for example, click the Reader button at the left end of the address bar. Likewise, reader mode is also available in other up-to-date mobile browsers.. ICHD-3 beta, like ICHD-2, is now available in digital format. The ICHD-3 beta website makes it very easy to understand and follow the precise organisation and content of the current classification, making the practical application in the clinical field and in research simpler than ever before. The three main chapters and the appendix are listed in the main menu. The respective diagnoses can be . The International Classification of Headache Disorders, 3rd edition (beta version) ICHD-3 beta 631 International Headache Society 2013. Table of Contents Preface 633 How to use the classiﬁcation 634 Classiﬁcation 636 Part one: the primary headaches 1. Migraine 644 2. Tension-type headache 659 3. Trigeminal autonomic cephalalgias 665 4. Other primary headache disorders 672 Part two: the .