Anxiety is a drain on one’s mental energy. To divert one’s attention from one’s fear, one may have to use more energy. They may believe that their nervous thoughts are interfering with their ability to think clearly. Meaning concentration and clear thinking may be compromised as a result. A person’s ability to complete a task and the degree of brain fog stemming from anxiety might vary depending on the activity. Brain fog may be exacerbated by anxiety, which affects a person’s ability to think clearly. Anxiety brought on by brain fog may also be exacerbated by having to complete the tasks at hand.