There is no fastest way to relieve pain in the back of the neck, according to the cause of the treatment, the common causes are muscle strain, fasciitis and cervical spondylosis, etc., the treatment includes conservative, physical therapy, drugs, etc.. 1. Muscle strain: prolonged low head work and play cell phone, resulting in the back of the neck with soreness, swelling, accompanied by local mild swelling, you can hot compresses on the neck, appropriate exercise and massage. 2. Fasciitis: neck pain, muscle tension or spasm, muscle weakness. Hot compresses can be applied to the neck, and non-steroidal anti-inflammatory drugs such as nimesulide can be taken at the same time. If necessary, it can be combined with physical therapy and other methods. 3. Cervical spondylosis: mainly manifested as neck discomfort, feeling neck soreness, swelling, inflexibility, accompanied by hand numbness, weakness, etc., can use non-steroidal anti-inflammatory drugs such as ibuprofen and so on. There are many other causes of pain in the back of the neck, such as cervical spine trauma, etc. If the above symptoms persist for a period of time and still do not see good, it is recommended to go to the hospital in a timely manner, the above drugs need to be used under the guidance of a doctor.