Manual Therapy + Exercise group will carry out 20-minute session of treatment. The techniques will be applied depending on the clinical findings in each patient and the objective will be to restore the function of C0-1 and C2-3 segments before applying cervical exercises. We will use manipulation (high velocity low amplitude) and/or mobilization (low velocity high amplitude) techniques of C0-1 and C2-3 segments with cervical exercise. Manipulations will be in the direction of traction, with the head in a neutral position. A maximum of two trials at each level on each side will perform (2-6 thrusts). Mobilization will be performed for 5 minutes using repeating cycles of 45 seconds of mobilization and 15 seconds of rest. The cervical exercise will perform by this group will follow the same methodology as the Exercise group.

This group will perform the cervical stabilization exercise. They will be teach to perform the contraction of deep neck flexor muscle activity with the help of the Stabilizer Pressure Biofeedback Unit (Chattanooga, USA) in supine. Exercise will be always carry out without pain, because pain can be an inhibitor of muscle contraction.

The Exercise group will carry out one 20-minute session, composed of 2 sets of 10 repetitions, holding each repetition for 10 seconds, a 40-second rest between each repetition and 2 minutes between sets.

Manual Therapy + Exercise group will carry out 20-minute session of treatment. The techniques will be applied depending on the clinical findings in each patient and the objective will be to restore the function of C0-1 and C2-3 segments before applying cervical exercises. We will use manipulation (high velocity low amplitude) and/or mobilization (low velocity high amplitude) techniques of C0-1 and C2-3 segments with cervical exercise. Manipulations will be in the direction of traction, with the head in a neutral position. A maximum of two trials at each level on each side will perform (2-6 thrusts). Mobilization will be performed for 5 minutes using repeating cycles of 45 seconds of mobilization and 15 seconds of rest. The cervical exercise will perform by this group will follow the same methodology as the Exercise group.

This test is used to see the amount of movement of the upper cervical spine and is the test most used in the literature. It is positive when there is a decrease of 10 degrees or more in the cervical rotation with maximum flexion, in a sense with respect to the contralateral or presents hypomobility of segment C1 with a mobility less than 33º

The Numeric Pain Rating Scale (NPRS) is a one-dimensional measure of pain intensity in adults. The NPRS is a segmented numeric version of the visual analog scale (VAS) in which a respondent selects a whole number (0-10 integers) that best reflects the intensity of his/her pain. The common format is a horizontal bar or line. Similar to the VAS, the NPRS is anchored by terms describing pain severity extremes.