My book deals with the most common concepts tested in American Board of Internal Medicine. It can also be useful as a basic reference for anyone interested in the field of Medicine. The book covers some common disease, their diagnosis, treatment, prevention and follow up care in various branches of Medicine including: Infectious disease, Neoplastic disease (Oncology), Degenerative disease of various body systems including Blood, Allergy&Immunology (Hematology), Cardiology, Pulmonology, Nephrology, Gastroenterology, Endocrine&Reproductive, Neurology&Special senses, Rheumatology, Dermatology, General IM including Biostatistics, Geriatrics, Pediatrics and Psychiatry.