The amazingly powerful human immune system works around the clock to keep you healthy. But when something goes wrong, your immune system can actually turn on you and make you sick instead. This book looks at the wide variety of issues that can crop up when the immune system isn't functioning as it should, including food allergies, eczema, and autoimmune disorders such as lupus.Diseases and disorders transform the experience of childhood, forcing kids to confront adult concerns that we wish they could avoid. The set Living with Diseases and Disorders provides reliable facts about some of the most significant chronic illnesses, while also offering reassuring tips and advice about how to manage the disorders and have the best life possible.Each title in this series includes color photos throughout, and back matter including: an index and further reading lists for books and internet resources. Key Icons appear throughout the books in this series in an effort to encourage library readers to build knowledge, gain awareness, explore possibilities and expand their viewpoints through our content rich non-fiction books. Key Icons in this series are as follows: Words to Understand are shown at the front of each chapter with definitions. These words are set in boldfaced type in that chapter, so that readers are able to reference back to the definitions—building their vocabulary and enhancing their reading comprehension. Sidebars are highlighted graphics with content rich material within that allows readers to build knowledge and broaden their perspectives by weaving together additional information to provide realistic and holistic perspectives. Educational Videos are offered in chapters through the use of a QR code, that, when scanned, takes the student to an online video showing a moment in history, a speech, or an instructional video. This gives the readers additional content to supplement the text. Text-Dependent Questions are placed at the end of each chapter. They challenge the reader's comprehension of the chapter they have just read, while sending the reader back to the text for more careful attention to the evidence presented there. Research Projects are provided at the end of each chapter as well and provide readers with suggestions for projects that encourage deeper research and analysis. And a Series Glossary of Key Terms is included in the back matter containing terminology used throughout the series. Words found here broaden the reader's knowledge and understanding of terms used in this field.