Morbidity

noun

1. The quality of being unhealthful or diseased, sometimes including the cause.
2. The quality of being morbid; an attitude or state of mind marked by gloom.
3. The incidence of a disease, as a rate of a population which is affected.
4. An occurrence of illness or disease, or a single symptom of that illness.
5. Adverse effects caused by a medical treatment such as surgery.