Anxiety is a normal and often healthy emotion, but it can become excessive and affect daily life. The main causes of anxiety can be broken down into three categories
Biological causes
Psychological causes
Environmental causes
Anxiety can also be a symptom of other underlying conditions such as depression, a personality disorder, or a medical condition, and the cause of anxiety may be a combination of these factors. It's important to see a doctor or a mental health professional if you have symptoms of anxiety that are disrupting your daily life so that the underlying cause can be determined and appropriate treatment can be given.