This Pathology and Immunology textbook contains principles that you need to understand pathology and immunology if you are a beginner at a College or University studying Pathology and immunology for the first time. The principles contained in this book helps you to understand the mechanisms of disease processes and how the body defends itself against injurious agents. It describes the basics of disease process so that you could understand the clinical presentation of disease. It attempts to answer the question why a person presents with unique clinical symptoms and signs. It attempts to explain the principles underlying genetic diseases and syndromes, to mechanisms of cancer development and predisposing factors. It is useful for tertiary education for students of Health and Allied sciences such as Post Basic nursing, Physiotherapy, Pharmacy, Biomedical science technologists, technicians and biomedical scientists. Above all for students of medicine who need a quick revision for the basics in pathology and immunology.