What is the earliest sign of increased intracranial pressure?

The earliest sign of increased intracranial pressure (ICP) is a change in level of consciousness (LOC). This is primarily because alterations in consciousness can occur due to the brain's response to various stressors, including increased pressure. As ICP rises, it affects cerebral perfusion and can lead to decreased cerebral function, resulting in confusion, lethargy, or more severe alterations in consciousness.

While other symptoms, such as pupil dilation, severe headache, and vomiting, may also indicate increased ICP, they typically arise later in the progression of the condition. Changes in LOC are sensitive indicators of brain function disturbances and often serve as a crucial warning sign for healthcare providers. Monitoring a patient's level of consciousness is essential in the early detection and management of conditions that could lead to increased ICP.