Hypervigilance is a state of heightened alertness and sensitivity to ones surroundings, in which the nervous system inaccurately filters sensory information. It is often linked to a dysregulated nervous system and can be a symptom of post-traumatic stress disorder (PTSD) and various types of anxiety disorders. People who have been in combat, have survived abuse, or have PTSD can exhibit hypervigilance. Hypervigilance can lead to a variety of obsessive behavior patterns, as well as producing difficulties with social interaction and relationships.

Symptoms of hypervigilance include fixation on potential threats, an increased startle reflex, dilated pupils, higher heart rate, elevated blood pressure, sweating, and fast, shallow breathing. Hypervigilance can have a serious impact on ones behavior and quality of life, causing difficulty sleeping, paranoia, and an inability to tolerate large gatherings or groups.

Hypervigilance is not a diagnosis on its own, but a symptom that is part of a set of other symptoms. It is a natural biological process that can be useful in small doses, but for those who live with trauma, anxiety, or other mental health conditions, it can be overwhelming and disruptive. Treatment options are available, including professional resources and self-care.