Medications
Steroids like prednisone or conditions like Cushing syndrome can cause an accumulation of fat on the back of the neck.
Osteoporosis
Compression fractures from weakened bones in the thoracic spine can cause the spine to hunch forward.
Posture
Three postural patterns can also create a neck hump form: thoracic hyper-kyphosis, cervical kyphosis, and forward head posture.
Exercises
Stretches/traction, Y-W-T exercise, and adjustments. It’ll give your neck and spine mobility to function, and also relaxes the muscles.
Lifestyle
Some underlying causes of a hump behind your shoulder may be result of sudden lifestyle changes.
Medicine
Medication adjustment. If a medicine is causing the hump behind your shoulder, you must stop or change your medicine.
Surgery
If a tumor is causing the hump behind your shoulders, your doctor may remove it surgically. You can remove it surgically by consulting your surgeon.
Conclusion
It will take some time and effort to get rid of the neck hump. Being persistent will help you achieve your health objective. Always seek advice from a physiotherapist before taking any steps.