side effect

An effect of a drug, chemical, or other medicine that is in addition to its intended effect, especially an effect that is harmful or unpleasant.

A problem that occurs when treatment affects healthy tissues or organs. Some common side effects of cancer treatment are fatigue, pain, nausea, vomiting, decreased blood cell counts, hair loss, and mouth sores.

Any way in which one representation differs from previous representations, but which is not revealed by the verification methods adopted, and can lead to failure to satisfy the security requirements [CESG].