Temperament

Temperament in mental health refers to biologically rooted patterns in how our nervous system responds to stimulation, stress, reward, and change. It shapes how strongly, quickly, and persistently we react — including our typical levels of energy, emotional intensity, and sensitivity to disruption — but it’s not the same as personality, character, or coping style. In the context of bipolar disorder, temperament helps explain why some people are more vulnerable to mood instability, sleep disruption, and energy surges long before any diagnosable episode occurs. These patterns are present early in life, tend to be stable over time, and reflect underlying neurobiological sensitivity rather than learned behavior or psychological defense. In sum: temperament describes how each person’s system is wired to react, not what they choose or intend—and important distinction for understanding just how biologically driven bipolar is.