This situation should be caused by strains of the posterior cervical muscle groups and ligaments. Generally can be gradually recovered. It will not compress the blood vessels and nerves.
Suggestions:
It is recommended to take sufficient rest. The first local topical Yunnan Baiyao aerosol to reduce pain. After stabilization, do a hot compress, physiotherapy, can consider doing acupuncture as soon as possible to reduce pain and relieve the tension of local muscle ligament. If necessary, take Chlorzoxazone drugs.