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What causes numbness from the left shoulder blade to the left arm, and what should I do about it?

Jun 05, 2023 Source: Cainiu Health
Dr. Lin Yunfei
Introduction
Numbness from the left scapula to the left arm may be caused by physiological factors, or pathological conditions such as periarthritis of the shoulder or cervical spondylosis. Patients can improve symptoms through general treatments, medications, surgical interventions, and other approaches. Specifically: if a patient sleeps in an improper posture that continuously compresses the left shoulder, it may lead to numbness extending from the left scapula to the left arm.

　　Numbness from the left scapula to the left arm may be caused by physiological factors, or it could result from pathological conditions such as periarthritis of the shoulder (frozen shoulder) or cervical spondylosis. Patients can improve symptoms through general treatments, medications, surgical interventions, and other approaches. Specific analyses are as follows:

　　I. Physiological Factors

　　If a patient maintains an improper sleeping posture that continuously compresses the left shoulder, it may lead to numbness extending from the left scapula to the left arm. This is usually a normal physiological phenomenon, which can often be improved through appropriate arm elevation exercises or massage.

　　II. Pathological Factors

　　1. Periarthritis of the Shoulder (Frozen Shoulder)

　　Periarthritis of the shoulder is typically caused by degenerative changes in the surrounding soft tissues. It commonly occurs due to chronic injuries resulting from prolonged overuse or poor posture. The main clinical manifestations include shoulder pain, restricted shoulder joint movement, and numbness. Patients may take medications such as ibuprofen capsules, Jingfukang granules, and Dahuoluowan according to medical advice for symptom management.

　　2. Cervical Spondylosis

　　Cervical spine injury may lead to cervical spondylosis, causing bone spurs in intervertebral discs, ligament calcification, and other changes that compress nerve roots, spinal cord, or blood vessels, thereby radiating symptoms to the left limb. This compression can result in numbness, neck and shoulder pain, and similar symptoms. When necessary, patients may consider surgical options such as anterior or posterior cervical spine surgery to alleviate symptoms.

　　In addition to the above causes, numbness may also result from other conditions such as fasciitis, suprascapular nerve entrapment, or hemiplegia following stroke. Patients should seek appropriate treatment under the guidance of a physician based on their specific condition.


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