Conditions that may affect your deltoid muscles include:
Adhesive capsulitis: This condition occurs when the capsule around your shoulder joint gets thick and stiff. It can cause shoulder pain, muscle spasms and stiffness. Another name for adhesive capsulitis is frozen shoulder.
Axillary nerve palsy: The axillary nerve supplies sensation to the deltoid muscle. Compression of or damage to the nerve can happen during surgery or due to a traumatic injury or overuse of a crutch. These issues can lead to shoulder weakness or numbness, especially around your deltoid muscle.
Bursitis: Shoulder bursitis is inflammation of the bursa (tiny, fluid-filled sacs) in your shoulders. The inflammation can make it hard to move your shoulder joint. It may also cause muscle irritation.
Deltoid fibrosis: Repeated shoulder muscle injections can lead to fibrosis. This condition causes the muscle to stop repairing itself. You may experience deltoid muscle pain or loss of muscle strength and mobility.
Rotator cuff tears: Sometimes severe rotator cuff tears damage or dislocate the deltoid muscle.
Shoulder impingement syndrome: Your shoulder muscles or tendons rub against bones. This friction, called shoulder impingement syndrome, leads to joint pain and inflammation.
Shoulder separation: A separated shoulder happens when the ligaments tear between the collarbone and the shoulder blade. In severe cases, surgery may be necessary.
Strains and overuse injuries: A shoulder strain is the result of overstretched muscle fibers. Strains can happen suddenly, or they might develop slowly over time due to repetitive overhead arm movements.
Tendonitis: Shoulder tendonitis occurs when the tendons in your shoulder get inflamed. Tendonitis can cause delt pain or make it difficult for you to use your shoulder muscles or move the joint.
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