Why is AIDS considered to be a "Syndrome" and not a disease?

Explanation

AIDS causing virus (HIV) enters the body of a person generally via sexual organs or blood transfusion and spreads to lymph nodes. It damages our immune system and, thus, body no longer is able to fight off many minor infections. Instead, even a smal cold infection can become pneumonia or a minor gut infection may lead to severe diarrhoea with blood loss. The effects of minor diseases become to severe that they kill the patient suffering from AIDS. In other words, there are no specific disease symptoms for AIDS and the patients develops complex diseases and symptoms. Therefore, AIDS is termed as 'syndrome' and not a disease.