Concept of disease  DR.HARIVANSH CHOPRA PROFESSOR COMMUNITY MEDICINE LLRM MEDICAL COLLEGE,MEERUT 5/2/ DR.HARIVANSH CHOPRA

5/2/2015DR.HARIVANSH CHOPRA 2 OBJECTIVE LEARN DEFINITION OF DISEASE CAUSES OF DISEASE NATURAL HISTROY OF DISEASE

Webster defines disease as "a condition in which body health is impaired, a departure from a state of health, an alteration of the human body interrupting the performance of vital functions". 5/2/ DR.HARIVANSH CHOPRA

The Oxford English Dictionary defines disease as "a condition of the body or some part or organ of the body in which its functions are disrupted or deranged" 5/2/ DR.HARIVANSH CHOPRA

From an ecological point of view, disease is defined as a maladjustment of the human organism to the environment" 5/2/ DR.HARIVANSH CHOPRA

DISEASE disease" literally means "without ease" (uneasiness) ­disease, the opposite of ease – when something is wrong with bodily function 5/2/ DR.HARIVANSH CHOPRA

Illness" refers not only to the presence of a specific disease, but also to the individual's perceptions and behaviour in response to the disease, as well as the impact of that disease on the psychosocial environment 5/2/ DR.HARIVANSH CHOPRA

Sickness" refers to a state of social dysfunction. 5/2/ DR.HARIVANSH CHOPRA

Disease is a physiological/psychological dysfunction; Illness is a subjective state of the person who feels aware of not being well; Sickness is a state of social dysfunction, ie., a role that the individual assumes when ill ("sickness role"). 5/2/ DR.HARIVANSH CHOPRA

DISEASE CAUSATION GERM THEORY MULTIFACTORIAL CAUSATION 5/2/ DR.HARIVANSH CHOPRA

CLASSIFICATION OF DISEASE COMMUNICABLE DISEASES NON COMMUNICABLE DISEASES NUTRITIONAL DISORDERS 5/2/ DR.HARIVANSH CHOPRA

CLASSIFICATION OF DISEASE NEOPLASTIC DISEASES METABOLIC DISORDERS DEGENERATIVE DISEASES 5/2/ DR.HARIVANSH CHOPRA

CLASSIFICATION OF DISEASE MENTAL DISEASES ACCIDENTS CONGENITAL DISEASE 5/2/ DR.HARIVANSH CHOPRA

COMMUNICABLE DISEASES VIRAL FUNGAL PARASITIC BACTERIAL 5/2/ DR.HARIVANSH CHOPRA

AGENTS Biological agents: Nutrient agents Physical agents Chemical agents Mechanical agents Absence or insufficiency or excess of a factor necessary to health Social agents 5/2/ DR.HARIVANSH CHOPRA

HOST FACTORS 5/2/ DR.HARIVANSH CHOPRA DEMOGRAPHIC GENETIC SOCIO-ECONOMIC LIFE STYLE

5/2/2015DR.HARIVANSH CHOPRA 17 ENVIRONMENT PHYSICALBIOLOGICAL PSYCHO- SOCIAL

Epidemiological triad AGENT HOST ENVIRONMENT DISEASE LOAD 5/2/ DR.HARIVANSH CHOPRA

HOST AGENT INCUBATION PERIOD DISEAS E SEVERE DISEASE SUB CLINICAL DISEASE DEATH RECOVER Y PRE PATOGENIC PHASE PATHOGENIC PHASE DISAB ILITY PRIMARY PREVENTION SECONDRY PREVENTION TERTIARY PREVENTION HEALTH PROMO TION SPECIFI C PROTEC TION EARLY DIAGNOSIS AND TREATMENT DISABILITY LIMITATION REHABILITAT ION NATURAL HISTORY OF DISEASE