3. Stress
Emotional stress wreaks havoc on the body. Stress releases hormones that put the body into overdrive and without a physical means to release the stress, it gets internalized. Many people hold their stress in their backs, causing muscle knots and pain.
Solution:
Use constructive ways to reduce stress: deep breathing and meditation, exercise, social interaction, acupressure, listening to music—whatever allows you to release tension.

9 Exercises to Relieve Neck and Shoulder Pain
It’s important to get to the source of the problem to completely alleviate pain. The following exercises will loosen things up, strengthen, and provide muscle flexibility. Perform all exercises in a series (one after the other) to engage all back muscles.
These exercises are designed to improve mobility of the neck and upper back and correct posture.