A symptom is a single sign, such as a sore throat or fatigue. A syndrome is a recognisable group of symptoms that occur together and point to a particular condition. One symptom rarely makes a diagnosis on its own; a syndrome is the pattern doctors look for.
The core difference
A symptom is one sign; a syndrome is a set of symptoms that habitually go together.
- symptom — a single sign of illness or disorder: A sore throat is a common symptom of the flu.
- syndrome — a recognisable group of symptoms pointing to a particular condition: Doctors diagnosed him with chronic fatigue syndrome.
How to tell them apart
Think of a syndrome as a collection built from symptoms, the way a bouquet is built from individual flowers. Chronic fatigue syndrome, for instance, typically involves joint pain, fatigue and a distinctive rash — several symptoms recognised as a single pattern, not just one complaint on its own.
Both words also stretch beyond medicine. A symptom can be a sign that something else is going wrong, as when rising crime rates are called a symptom of deeper economic problems. A syndrome can label any recurring set of negative traits or behaviours, such as the so-called ‘second-album syndrome’ in music.
