Hello,
This crackling is most probably from changes of Osteo-Arthritis in your neck and Shoulders.
This would cause formation of Bone Spurs and other joint changes that would cause this crackling and would increase on movement.
I would advise you to see a doctor, preferably an Orthopedist for an X ray of your Neck and Shoulders to confirm this.
Regular and appropriate exercise would help prevent further degeneration that can cause a nerve compression ( radiculopathy ).
Kind Regards, Dr.Joshi
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Yes, this can be cartilage wear and tear and thus not picked on the X ray.
You can take Glucosamine and Chondroitin Sulfate supplements, that can help with cartilage wear.
Doctor
Medical Diagnostics : X ray, CT Scan, MRI, Ultrasound, Angio. Caring Doctor. Your Health, First !