From my experience in dealing with patients with chronic issues, I’ve seen negative emotions vary in their way of expressing themselves in the body. Negative emotions bring the nervous system out of homeostasis, causing people to become either sympathetic-dominant or parasympathetic-dominant which puts people on the road to bad health, chronic pain or stiffness. The chronic pains people carry are almost always the reflection of the emotional stresses they hold on to. For example, I had a patient who came to me because he had a headache that lasted 8 months- his root stress was the feeling of envy because his friends were richer than him. I had 2 other patients with perpetual headaches, and their root stresses were completely different. So anytime your body is not in homeostasis, it’s the body giving you an alarm to examine the emotional stress you’re holding onto consciously or unconsciously. That emotional alarm varies. The only general thing I can say is emotions directly affect the nervous system.