Anxiety is a natural emotional response to pressure, but it can become overwhelming when it's intense, persistent, and interferes with daily life. It is characterized by feelings of fear, worry, and unease, which can manifest as physical symptoms like a rapid heartbeat, sweating, and shaking, as well as mental symptoms such as difficulty concentrating, irritability, and sleep problems. When anxiety is excessive and persistent, it is considered an anxiety disorder, a condition that can sometimes be treated with professional help.