The quality of life may be restricted due to the severity of the disorder. Some may go through life and be able to ease the problem others it may be too severe and be admitted into a mental hospital, it all depends on the mental state.
Studies shown people with moderate to severe anxiety and panic disorders have a lower life expectancy. Reason being is because doctors say along with anxiety and panic disorders come bad lifestyle factors such as lack of exercise, weight gain, diabetes, alcohol, and smoking.
The exact cause of anxiety and panic disorders is unknown, like many other mental illnesses. However, it's become clear that many of these disorders are caused by a combination of factors including changes in the brain ad environmental stress.