chronic pain

• Pain serves an important purpose by alerting you to injuries such as a sprained ankle or burned hand. Chronic pain, however, is often more complex. People often think of pain as a purely physical sensation. However, pain has biological, psychological and emotional factors. Furthermore, chronic pain can cause feelings such as anger, hopelessness, sadness and anxiety. To treat pain effectively, you must address the physical, emotional and psychological aspects. 
•  Studies have found that some psychotherapy can be as effective as surgery for relieving chronic pain because psychological treatments for pain can alter how your brain processes pain sensations. 
•  Having a painful condition is stressful. Unfortunately, stress can contribute to a range of health problems, including high blood pressure, heart disease, obesity, diabetes, depression and anxiety. In addition, stress can trigger muscle tension or muscle spasms that may increase pain. Managing your emotions can directly affect the intensity of your pain. 

As cited from the American Psychological Association