Which symptom is NOT a sign of shock?

In the context of shock, a key characteristic is a drop in blood pressure due to inadequate circulation and impaired blood flow to vital organs. Increased blood pressure is not typical in shock; instead, shock often presents with low blood pressure. This occurs as the body struggles to maintain an adequate perfusion of tissues, causing signs and symptoms like mental confusion, clammy skin, and nausea. Mental confusion reflects reduced oxygen and nutrient delivery to the brain, while clammy skin indicates peripheral vasoconstriction as blood is diverted to vital organs. Nausea can result from poor perfusion affecting gastrointestinal function. Therefore, increased blood pressure does not align with the physiological response seen in shock, making it the correct answer in this context.