συνδρομή

Syndromḗ in Greek means a running together, a concurrence, from syn (together) and dramein (to run). Galen used the word in the second century CE for a collection of symptoms that appeared together regularly. The word distinguished what doctors could observe (symptoms running together) from what they could not yet explain (why). A syndrome is an observed pattern awaiting an explanation.

Thomas Sydenham, the 'English Hippocrates,' advanced the concept in the seventeenth century. He argued that diseases should be classified by their symptoms, the way botanists classify plants by their characteristics. A syndrome was a natural grouping — symptoms that consistently co-occurred formed a recognizable entity. Sydenham did not know the causes of most diseases. But he could see the patterns.

Down syndrome was described by John Langdon Down in 1866 — a consistent pattern of physical features and intellectual disability. The chromosomal cause (trisomy 21 — three copies of chromosome 21 instead of two) was not discovered until 1959 by Jerome Lejeune. For ninety-three years, Down syndrome was a syndrome in the original sense: a running-together of symptoms without a known mechanism. The word held the place until the science arrived.

Modern medicine has hundreds of named syndromes. Stockholm syndrome. Irritable bowel syndrome. Metabolic syndrome. Some have known causes. Others remain patterns without explanations. The word preserves its original humility — a syndrome is what doctors can describe before they can explain. The Greek running-together is an honest admission that observation comes before understanding.