The medical literature is enormous. It is filled with information that is growing as you are reading this sentence. Having entered the realm of medical school and residency, it is very difficult to gather and master the information that is most critical. After much review of current USMLE Board preparation texts, we have attempted to create a more concise and focused text that addresses the heart of the major issues that are not only commonly tested but also encountered as one is taking care of sick patients. We have put much thought and effort into providing a text that can be used by pre-medical and medical students, as well as physicians and those in all scientific fields. Our goal is to provide an avenue of knowledge that can be used to heal that which is most important to us: Our Patients! Enjoy!