Book excerpt: For more than 25 years, Ferri's Clinical Advisor has provided immediate answers on the myriad medical diseases and disorders you're likely to encounter in a unique, easy-to-use format. A bestselling title year after year, this popular "5 books in 1" reference delivers vast amounts of information in a user-friendly manner. It is updated annually to provide current and clinically relevant answers on over 1,000 common medical conditions, including diseases and disorders, differential diagnoses, clinical algorithms, laboratory tests, and clinical practice guidelines?all carefully reviewed by experts in key clinical fields. Extensive algorithms, along with hundreds of high-quality photographs, illustrations, diagrams, and tables, ensure that you stay current with today's medical practice. - Contains significant updates throughout all 5 sections, covering all aspects of diagnosis and treatment. - Features 26 all-new topics including eosinophilic gastroenteritis (EGE), retroperitoneal abscess, adenomyosis, periprosthetic joint infection, tonic pupil, rectal adenocarcinoma, nightmares and dream disturbances, avoidance/restrictive food intake disorder (ARFID), hypokalemia, cardiac implantable electronic device infection, heparin resistance, and hypertrophic pyloric stenosis, among others. - Includes useful appendices covering palliative care, preoperative evaluation, nutrition, poison management, commonly used herbal products in integrated medicine, and much more. - Offers online access to newly revised and updated Patient Teaching Guides in both English and Spanish. - Any additional digital ancillary content may publish up to 6 weeks following the publication date.