Depression and anxiety symptoms often tend to overlap, especially in the older population, leading to an under-diagnosis of anxiety. However, treatment for the two disorders can be different - that's why it's important to accurately diagnose and assess.
Often I think I'm fine, but then the physiological symptoms of anxiety kick in and I start the anxious thinking. Personal experience suggest to me that the James-Lange theory of emotion is the most plausible.
9 Signs You Suffer from an Anxiety Disorder Anxiety is a normal part of human life. You may have felt anxiety before addressing a group or applying for a job, for example. In the short term, anxiety increases your breathing rate and heart rate.