Morbidity refers to the quality or state of being unhealthful or the quality of being diseased. This is used mostly to describe the condition of someone who has been afflicted by a particular disease to the extent that he or she can't function as a healthy person. This can be measured, and the common ICU that is normally used is SOFA, SAPS II, APACHE II, etc.
The morbidity rate is different from the mortality rate as it does not include the rate of those who are dying of a particular disease. The morbidity rate is simply telling us the extent to which a particular disease affects the healthy functioning of a particular person. On the other hand, mortality refers to the condition of being susceptible to death. It is a term that is telling us that an individual can only exist for a particular period of time. Although what makes men be mortal can be attributed to aging, sickness, injury, etc. but mortality is just nature's way of telling us that all living things have limited time on Earth.
Morbidity and mortality are two words that are very similar in meaning. Morbidity is a state of having inferior health. Whenever a person is diagnosed with a disease, the word morbidity is used by doctors. However, it is not a modern word that is used today to describe someone’s condition because it sounds so bleak.
The morbidity rate is the rate of incidence of a disease or frequency of disease in a certain population. Mortality describes death as being imminent or very close. The mortality rate refers to the number of people dying due to illness in a population. It is expressed in terms of the number of deaths per thousand in a year.