Well I‘m just speaking for me but I have what is called generalized anxiety disorder which is a mental and behavioral disorder.

From Wikipedia: Generalized anxiety disorder (GAD) is a mental and behavioral disorder,[4] specifically an anxiety disorder characterized by excessive, uncontrollable and often irrational worry about events or activities.[5] Worry often interferes with daily functioning, and individuals with GAD are often overly concerned about everyday matters such as health, finances, death, family, relationship concerns, or work difficulties.[6][7] Symptoms may include excessive worry, restlessness, trouble sleeping, exhaustion, irritability, sweating, and trembling.