Which of the following is a symptom of anxiety disorders?

Excessive worry is recognized as a core symptom of anxiety disorders. Individuals experiencing anxiety often find themselves preoccupied with thoughts of potential future threats or negative outcomes. This overwhelming sense of apprehension can manifest in various aspects of life, making it difficult for individuals to concentrate on tasks or enjoy activities. The pervasive nature of this worry can lead to physical symptoms as well, such as restlessness, fatigue, and trouble sleeping. In contrast, increased energy levels, heightened focus, and smiling frequently generally do not align with the typical manifestations of anxiety disorders, as these are more indicative of positive emotional states or energies rather than the distress that anxiety typically generates.