Stress levels refer to the intensity of stress a person experiences, which can vary from mild to severe. Stress is a natural response to challenges or demands, often triggered by factors such as work, relationships, or health issues. It can affect both mental and physical well-being, leading to symptoms like anxiety, fatigue, or headaches. Measuring stress levels can be done through various methods, including self-assessment questionnaires or physiological indicators like heart rate. High stress levels over time can lead to chronic conditions, making it important to manage stress through techniques such as mindfulness, exercise, or seeking support from mental health professionals.