Can being in pain cause anxiety?

Yes: If u don't know what is causing the pain and u start worrying.

Very common: Anxiety and depressive disorders are common co-occurring conditions with chronic pain. Since these can further reduce coping and increase muscle tension there is often a vicious circle of pain contributing to depression and anxiety and vice versa. It is often important to treat both. Psychiatric medications can help as can cognitive behavioral approaches. See http://cpancf.Com/chronic_pain.Asp.