Which of the following is NOT a sign or symptom of shock?

Flattened neck veins are not typically considered a sign or symptom of shock. In fact, during shock, neck veins often appear distended due to increased central venous pressure. Shock can lead to reduced blood volume, which usually causes the veins to appear more collapsed, but this is not a common clinical sign.

In cases of shock, the body exhibits various signs due to inadequate perfusion and oxygenation of tissues. Altered mental status, pale, cool, and clammy skin, as well as symptoms like nausea and vomiting, are all physiological responses to shock. Altered mental status can occur as a result of decreased blood flow to the brain, while pale and clammy skin reflects peripheral vasoconstriction. Nausea and vomiting may occur as a response to stress and reduced blood flow to the digestive system. Thus, while signs and symptoms of shock can vary, flattened neck veins do not fit within the established profiles of shock indicators.