Hello sir .. are you in a desk job .. having prolonged hours of sitting.. pain going to one side of neck .. looks like a trapezius ms Spasm..if pain goes only to shoulder level ..
If pain going beyond Shoulder to hand could be radiation of neck pain
Next Steps
Need to consult a physiotherapist for proper guidance and exercise plan
Health Tips
Can apply some kind of pain relief ointment and than hot Pack for some relief ..