A syndrome is a group of signs and symptoms that occur together and characterize a particular abnormality or condition.
Syndromes are usually named after the person who discovered them or after the main symptoms.
Examples:
Down syndrome is a well-known syndrome.
He has a syndrome that makes him feel tired all the time.
The syndrome includes a rash and a fever.
The grumpy syndrome makes people not want to talk to you.
The superhero syndrome gives you special powers.
The happy syndrome makes everyone smile.