This is the throughly revised enlarged and updated edition of the popular text. The textbook retains its simplicity, lucidity and clarity of writing the hallmark features apprecaited by this medical students as well as teachers. The textbook covers all the topics as per the recommendations made in the latest MCI syllabus. Besides being the must read for undergraduate medical students, the text also caters to the needs of the candidates preparing for postgraduate entrance examination. Students of dental sciences, pharmacy, nurisng and other paramedical courses will find it particulary useful just like the earlier edition.