Objectives: To evaluate the clinical efficacy of using a manual inhibition technique for the suboccipital muscles compared with the use of the so-called INYBI tool in individuals with chronic non-specific neck pain, and the compare the results of using both approaches on pain relief, cervical range of motion neck and vertical maximum mouth opening.

Design: Quantitative, experimental, longitudinal, prospective, and double blinded study.

Subjects: Patients between 18 and 40 years, with chronic non-specific neck pain of at least 3 months of evolution.

Methods: The experimental group will undergo a 5 minutes intervention for the suboccipital muscles using the INYBI tool. The control group will receive a 5 minutes of treatment involving the suboccipital muscles manual inhibition technique.

Inclusion Criteria:

• Clinical diagnosis of non-specific mechanical neck pain.
• Pain of more than 3 months of duration.
• Pain between the occiput and the third dorsal vertebra.
• Willingness to participate in the treatment and in the follow-up measurements
• Neck pain reproduced by neck movements or palpation

Exclusion Criteria:

• Cognitive impairment or inability to communicate.
• Having received manual therapy in the last two months before recruitment.
• Having received anti-inflammatory treatment, antidepressants or muscle relaxants in the last 72 hours.
• Any contraindication to treatment or evaluation procedures.
• Diagnosis of systemic diseases
• Diagnosis of fibromyalgia
• Pregnancy
• Signs of spinal nerve root compression
• Previous whiplash
• Any diagnosed possible cause for their neck pain (infection, cancer, spinal stenosis)