What is an example of a physical withdrawal symptom?

Tightness in the chest is an example of a physical withdrawal symptom because it represents a physiological response that can occur when an individual stops using a substance to which they have become dependent. Physical withdrawal symptoms are bodily reactions that may include discomfort, pain, or distress, which often arise from the body's adjustment to the absence of a substance. In this case, tightness in the chest can be associated with anxiety or other withdrawal-related responses, making it a clear indicator of physical withdrawal.

In contrast, mood swings, restlessness, and depression are primarily psychological symptoms. While they can certainly accompany withdrawal and are important to recognize, they do not encompass the physical aspect that tightness in the chest illustrates. Physical withdrawal symptoms typically have observable and tangible manifestations in the body, whereas the others listed focus more on emotional or behavioral changes.