Psychosomatic disorders are physical illnesses that are thought to arise from emotional or mental stressors, rather than direct physical causes. These conditions demonstrate how psychological factors can significantly influence physical health, often manifesting as pain, fatigue, or other somatic symptoms without an identifiable medical explanation.

University of Michigan - Ann Arbor

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A disease is any condition in which the normal structure or function of the body is damaged or impaired.

Disease

The International Classification of Diseases (ICD) is used in clinical settings to classify diseases and track morbidity (the number of cases of a disease) and mortality (the number of deaths due to a disease) rates.

Classifications of Disease

The five phases of disease are:
- Incubation
- Prodromal
- Illness
- Decline
- Convalescence

Phases of Disease

Signs of disease are objective and measurable, and can be directly observed by a clinician.

Signs of Disease

Symptoms of disease are subjective. They are felt  by the patient, but they cannot be clinically confirmed or objectively measured by a clinician.

Symptoms of Disease

- Skin & Eye
- Respiratory System 
- Urogenital System 
- Digestive System 
- Circulatory System
- Lymphatic System
- Nervous System
- Immune System

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