Worry and unease are two words that are often used to describe the same feeling of ANXIETY. ANXIETY is a mental health disorder characterized by feelings of worry, unease, and fear. It can be caused by a variety of factors, including genetics, environment, and life experiences. Symptoms of ANXIETY can include restlessness, difficulty concentrating, and physical symptoms such as sweating, trembling, and an increased heart rate. Treatment for ANXIETY can include medication, therapy, and lifestyle changes.