You might not immediately associate shoulder stiffness with the autonomic nervous system, but once you understand the connection, it will start to make sense.
Many people know that shoulder stiffness is often caused by poor blood circulation due to muscle weakness or prolonged static posture, such as sitting at a desk for long hours.
However, one crucial factor that shouldn’t be overlooked is the role of the autonomic nervous system.
The main muscle associated with shoulder stiffness is the trapezius, a thick muscle in the upper back and neck. The nerves that control this muscle belong to a group of cranial nerves, which are closely linked to the autonomic nervous system.
When the body detects an abnormality, it signals distress by causing muscle tension. The trapezius plays a key role in this warning mechanism, which is why it commonly becomes stiff and tight.
Additionally, the area from the neck to the upper back contains many “nerve ganglia,” which serve as relay points for the autonomic nervous system. (In traditional Eastern medicine, this area is also known for having many acupressure points related to autonomic function.)
In most cases, shoulder stiffness initially presents as a dull, heavy sensation in the trapezius muscle. However, if left untreated, poor circulation can cause a lack of oxygen in the muscles, leading to pain rather than just discomfort.
At this stage, it can also result in “tension headaches,” a type of headache caused by restricted blood flow. In severe cases, it may even lead to nerve-related symptoms such as numbness.
Unlike pain caused by muscle inflammation, these symptoms don’t respond well to painkillers, which only provide temporary relief. Autonomic nervous system dysfunction can also cause shallow breathing, dizziness, tinnitus, nausea, insomnia, and jaw discomfort.
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