Dear Madam, I can understand your concern. A detailed clinical examination by a orthopedic Shoulder Surgeon is recommended.

Hot Fomentation. Gentle Shoulder Stretching. Core Strengthening Exercises. Gentle Neck Exercises. Avoid sleeping on affected side.. Warm up and cool down is a must.

Physiotherapy treatment and stretching exercises of neck and shoulder. Posture correction must. Avoid computer work

It can be due to sue to some cervical problem like discitis/or disc slip/some sometimes due to simple wrong postural habits like long sitting/travelling /computer work/prolonged neck bending. Sometimes it can be associated with any tingling/heaviness /numbness ain arms and hands. But if its associated with the lack of range of motion of shoulder, it can be frozen shoulder.

Plz visit any good physiotherapist close to get assessed and have a better management, ofcourse you may be having simultaneous deficiencies for which you can be guided to appropriate medical faternity by your physio, after assessment.

Pls consult a therapist or orthopaedic surgeon for initial assessment and treatment planning