Depression is more than just feeling sad; it's a persistent feeling of hopelessness and despair that can linger for weeks, months, or even years. Symptoms may include persistent sadness, loss of interest in activities, changes in appetite or sleep patterns, and feelings of worthlessness or guilt. Anxiety, on the other hand, manifests as excessive worry, fear, and nervousness, often accompanied by physical symptoms such as rapid heartbeat, sweating, and trembling.