Quality of life is a concept incorporating all factors that impact upon an individual's life . The concept has been divided into several components, including psychological, social, and physical domains. All clinicians use an intuitive view of how much the disease is affecting their patients when taking management decisions, but patients may assess QoL differently from their doctors. The use of simple QoL measures is usually welcomed by patients who wish to express their concerns. Methods of measuring the extent and severity of a disease are based on assessment of signs and symptoms. This information does not necessarily correlate with QoL measures. It is therefore important to have two viewpoints of a disease, the viewpoint of doctors and that of patients.
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