General Pathology: Mechanisms of Disease Explained

About this course

Every disease you will ever encounter — whether a swollen joint, a heart attack, a tumor on a scan, or a deadly infection — traces back to a small set of universal mechanisms that pathology has spent two centuries decoding. General pathology is the conceptual foundation of all clinical medicine, and without it organ-specific knowledge becomes a list of facts to memorize rather than a coherent science to understand. This course gives you that foundation in a structured, vivid, and clinically grounded way.

You will begin with cell injury and adaptation, learning how cells respond to stress, when adaptation tips into reversible injury, and what defines the point of no return that commits a cell to necrosis or apoptosis. You will then master inflammation in depth — the vascular and cellular events of the acute response, the rich chemistry of mediators, the cellular cast of chronic inflammation, the distinctive pattern of granulomatous disease, and the orchestrated phases of tissue repair and wound healing. Hemodynamic disorders come next, with thorough coverage of edema, congestion, hemorrhage, thrombosis and Virchow's triad, every major type of embolism, the difference between red and white infarcts, and the five categories of shock with their pathogenesis and clinical stages. The neoplasia section builds a complete framework for understanding cancer: tumor nomenclature, the features distinguishing benign from malignant growth, grading and staging, the molecular hallmarks of cancer, oncogenes and tumor suppressors and DNA repair genes, chemical and radiation and viral carcinogenesis, tumor immunity, and the clinical syndromes that cancer produces including paraneoplastic effects and cachexia. The course closes with infectious disease pathology, examining how microorganisms cause disease, how host-pathogen interactions determine outcomes, and the characteristic tissue reactions that point to each class of agent.

This course is designed for medical and dental students preparing for board examinations, pathology residents building their conceptual foundation, allied health professionals who need to understand disease mechanisms at a deeper level, and any motivated learner who wants to make sense of how the body breaks down and how it tries to repair itself. No prior pathology background is required, only a working knowledge of basic biology and human anatomy. By the end you will think the way pathologists think — recognizing patterns, reasoning from mechanism to morphology to clinical presentation, and connecting the dots across every organ system you will later study.

What sets this course apart is its commitment to teaching pathology as a way of thinking rather than a body of facts to memorize. Every concept is grounded in concrete clinical examples, every mechanism is paired with the disease it explains, and every section builds on the last to give you a lasting framework. Enroll now and gain the conceptual foundation that will serve you for the rest of your medical career.

What you'll learn

• Distinguish reversible from irreversible cell injury and identify the patterns of necrosis and regulated cell death
• Trace the vascular and cellular events of acute inflammation and the chemical mediators that drive them
• Recognize chronic and granulomatous inflammation and explain the mechanisms of tissue repair and wound healing
• Apply Virchow's triad to predict thrombosis risk and understand the fates of a thrombus
• Classify embolism, infarction, and shock by mechanism, morphology, and clinical stage
• Name any tumor correctly using standard nomenclature and distinguish benign from malignant behavior
• Explain tumor grading versus staging and apply the TNM system to clinical decision-making
• Describe the molecular hallmarks of cancer and the roles of oncogenes, tumor suppressors, and DNA repair genes
• Connect chemical, radiation, and viral carcinogens to the specific cancers they cause
• Identify the tissue reactions characteristic of each major class of infectious agent

Course outline

34 on-demand lessons across self-paced modules. Expand each part to see what it covers.