Symptom

Any affection which accompanies disease; a perceptible change in the body or its functions, which indicates disease, or the kind or phases of disease; as, the causes of disease often lie beyond our sight, but we learn their nature by the symptoms exhibited.

A sign or token; that which indicates the existence of something else; as, corruption in elections is a symptom of the decay of public virtue.

(medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease

anything that accompanies X and is regarded as an indication of X's existence