This pain is due to overuse of muscles so for a short time avoid exertion for some time. Along with the rest you can start Homoepathy medicine because medicine are effective and natural also.

Take Homeopatic medicine and exercise 

Hello, If you are experiencing pain definitely your posture of sitting wouldn't be that correct.please improve your posture.Also it is recommended to do some full body exercise and back stretches in order to keep your muscle contract and relax to regain its original position .If you need any help on this ,you may contact your homoeopath.

It’s a muscular strain. Ice pack n homeopathy medication ll help you. Avoid position wic discomfort you. Chat online for consultation and treatment

Hi dear homoeopathic medicines will give you best results naturally You can easily take an online consultation for further treatment guidance Medicines will reach you via courier services

Is there any injury happened? Share complete details about symptoms and history of your problem. Homoeopathic medicines will help you reduce and cure this problem effectively and without any side effects.

Hello sir, Needs proper history and clinical discussion, please consult on my personal app, its completely free. *You can have chat or video call discussion* http://arth.link/drortho Or https://play.google.com/store/apps/details?id=tech.arth.drjaideepgaver If link is not clickable than search *dr ortho by dr j.d. singh* in your play store

I hope there was no injury. For pain relief—Apply ice and heat. Both hot and cold therapy may decrease the discomfort of muscle pain. Applying ice can help reduce inflammation and pain in the trapezius. Heat can effectively reduce muscle spasms, increase blood flow to the area, and promote healing. For details consult online