Which term refers to the collection of symptoms that tend to occur together?

The term that refers to the collection of symptoms that tend to occur together is "syndrome." A syndrome is characterized by a group of medical signs and symptoms that are often linked to a specific condition or disease. For instance, in medicine, conditions such as Down syndrome or irritable bowel syndrome are defined by a recognizable pattern of symptoms that commonly occur together, making it possible to identify a specific disorder.

The other terms do not convey the same meaning. "Symptoms" typically refer to individual indicators reported by patients, while "signs" refer to the observable evidence of a condition typically noted by healthcare providers. "Patterns" may suggest a recurring arrangement of incidents or data but does not uniquely describe the grouping of symptoms associated with a particular condition. Thus, "syndrome" is the most precise term for a collection of symptoms that are grouped together.