Final answer:
Comorbidity refers to the coexistence of two or more distinct health problems within an individual. Syndrome describes a set of symptoms that characterize a disease. Endemic is the term for a disease that is consistently present within a population.
Step-by-step explanation:
The coexistence of two or more distinct health problems is known as comorbidity. A syndrome, on the other hand, refers to a specific group of signs and symptoms characteristic of a particular disease. A chronic condition is a long-lasting health issue that may not necessarily involve the simultaneous presence of other diseases. Furthermore, a disease that is constantly present in a population is called endemic, as opposed to a pandemic or an epidemic, which refer to wider and often more temporary spreads of disease.