Symptom (noun)

1. A phenomenon that is experienced by a patient and is associated with a particular disease or condition.
2. A sign or indication of the presence of something.

Origin:

Late 16th century (denoting a sign or token of something): from french symptôme, or via latin from greek sumptōma "a falling together, coincidence," from sumptein "fall together," from syn- "together" + piptein "fall".

Examples:

1. Headaches are a common symptom of stress.
2. Dizziness is a symptom of high blood pressure.
3. The rash was a symptom of chickenpox.
4. The increase in temperature is a symptom of fever.
5. The symptom of fatigue is common in patients with cancer.