Rehab is the most effective treatment strategy for addiction, not a cure for anxiety. However, rehab treatment can also be very beneficial for people suffering from anxiety disorders. Many of the addiction therapies you take part in during rehab will have a positive knock-on effect on your anxiety such as reducing stress and enabling you to develop healthier coping strategies for challenging moments. Many substances can also fuel anxiety so once you are drug- or alcohol-free, you will likely find that your anxiety is more manageable.