Rapid heartbeat or palpitations Shortness of breath or hyperventilation Muscle tension or headaches Nausea, diarrhea, or upset stomach Sweating or shaking These physical symptoms of anxiety can occur in response to stressful or threatening situations and may feel like a “fight or flight” response. It’s important to remember that anxiety is a normal response to stress, but when it becomes chronic or interferes with daily life, it may be time to seek help from a mental health professional.