Definition of Disease
Disease (Latin dis- = lack of, opposite of + ease = convenience, comfort) literally means lack of strength or satisfaction. It also means a person is no longer at ease.
In medicine, disease means an impairment in structure or function of a certain body part or mind with identifiable symptoms or signs. Morbus is a Latin word for disease. This is ideal definition but disease should be seen as any temporary or permanent disturbance in the body that disrupts the state of balance in the body (homeostasis). This balance necessary for a person to be in good health and function optimally.
Illness, Sickness, Malady, Malaise
When referring to patient’s personal experience of a disease, synonyms illness and sickness are usually used. Ailment refers to minor or chronic illness. Malady (French malady = disease) refers to chronic or deep-seated disease. Malaise (French mal- = bad; aise= ease) is a vague feeling of general weakness and discomfort, commonly appearing at the onset of an illness.