Hi ,if you are not able to lift your shoulder more than 90° that might be shoulder pain ,if you are feeling burning or numbness,pain in your hand that might be neck issue also ,there are multiple causes, one of the reason may be your job and lifestyle.
There are multiple causes
Please try to take Consultation once to find the root cause
Next Steps
until you maintain a good posture at your work and take proper rest
Health Tips
take work breaks every Hour and walk 10 steps to engage physical activity while doing work