Experimental: Myofascial Release (MR) + Therapeutic exercise (TE)

Patients in the MR+TE group will undergo 12 sessions (3 d/week) of sub-occipital inhibition treatment as a combined muscle and soft tissue inhibition technique. The physiotherapist will apply deep pressure which will be maintained for a total of 10 minutes until the sub-occipital tissues are released. In addition to this technique, the method of pumping and manual treatment (acupressure) of the trigger points on the sub-occipital muscles, on the upper bundles of the trapezius bilaterally, on the sternocleidomastoid bilaterally and on the scalene muscles bilaterally will be applied for a further 10 minutes for a total treatment with myofascial release equal to 20 minutes. At the end of the MR session, the 20-minute TE session will be performed in the same way as described in the TE intervention group.

Experimental: Manual therapy (MT) + Therapeutic exercise (TE)

The MT+TE intervention group will carry out rehabilitation treatment with a structured protocol based on mobilizations according to the Mulligan method. Treatment according to Mulligan will be carried out at the discretion of the therapist on the basis of daily evaluations of cervical dysfunction and the eventual manifestation of headache. 5 different techniques will be performed on the patient in 12 sessions (3 v/week, for 4 weeks) as described in Satpute, K., Bedekar, N. \& Hall, T. Effectiveness of Mulligan manual therapy over exercise on headache frequency, intensity and disability for patients with migraine, tension-type headache and cervicogenic headache - a protocol of a pragmatic randomized controlled trial. BMC Musculoskelet Disord 22, (2021)..

Experimental: Therapeutic exercise (TE)

Patients in the TE intervention group will be asked to perform 12 sessions (3 day/week) of TE supervised by a physiotherapist. Each session will have a total duration of 40 min divided into 20 min of aerobic exercise and 20 min of TE. Aerobic exercise consists of a total of 20 min of activity on a stationary bike using parameters to increase performance (intensity over 20 min) progressively based on fatigue (Borg scale).The TE consists of warm-up and cool-down exercises for the cervical ROM, associated with stretching exercises of the cervical and scapulothoracic muscles. After the warm-up, muscle strengthening exercises will be performed (isometric, concentric and eccentric contractions of the cervical muscles).

Active_comparator: Control

Patients assigned to the control group will follow the pharmacological treatment according to medical doctor indications (clinical practice).