Final answer:
Signs of pain in a non-verbal patient include facial grimacing, restlessness, changes in vital signs, sensitivity to touch or movement, and altered behaviors like agitation.
Step-by-step explanation:
A non-verbal patient may exhibit pain through various behaviors and physiological responses since they cannot communicate their discomfort verbally. Some of these indicators include facial grimacing, restlessness, increased skin conductance fluctuations due to sympathetic activity, changes in vital signs like heart rate or blood pressure, and either withdrawal from or unusual stillness to avoid further pain. These pain responses can be detected during a physical examination where, for instance, the patient may exhibit sensitivity or discomfort to touch or movement, or through observing changes in behavior such as agitation or non-responsiveness which can also indicate the presence of pain.