This book is a guide to the most common diseases, from the intricacies of diagnosis to the most effective methods of treatment. It was created based on the recommendations of the best specialists from the team of the “About the Most Important” program, led by Dr. Agapkin.• Which diagnostic method will help identify the disease at the earliest stage?• What needs to be done for effective treatment?• How to give fighting back the disease?• How to choose the right sanatorium for successful rehabilitation? With the help of this book you will learn to understand the correct treatment and will be able to choose the most competent specialist. This book provides complete, structured and understandable information for each disease. Based on the knowledge gained from this book, you will be able to choose the shortest and most effective path to recovery.