Patients will have 1 session per week, during 4 weeks, making 4 sessions in total. Each session will last 30 minutes. Each session consists of:

• Transverse planes in the thoracolumbar fascia and abdomen: The physical therapist place his hands facing each other so that one hand is between the tables and the patient's thoracolumbar fascia and the other on the abdomen
• Transverse planes at C7-D3 and sternum: The physical therapist, places one hand between the table and the patient's first 4 thoracic vertebrae (C7-T4) and the other on the sternum.
• Suboccipital inhibition: the physical therapist, places his hands under the patient's head transversely between the occipital and the spinous process of C2. After, the head is lowered in such a way that the occipital bone rests on the tenar eminences and a slight traction is maintained cranially.

Patients will have 1 session per week, for 4 weeks, which means 4 sessions in total. Each session will last 30 minutes. Each session consists of:

• Postero-anterior cervical sliding: the patient's cervical vertebrae will be evaluated with the 4 degrees of postero-anterior sliding, and the pain at each vertebral level is recorded. Then, the most painful vertebra previously detected will be treated.
• Postero-anterior lumbar slippage: the patient's lumbar vertebrae will be evaluated with the 4 degrees of postero-anterior slippage, and the pain at each vertebral level is recorded. Afterwards, the most painful vertebra previously detected will be treated.
• Postero-anterior dorsal slippage: the patient's dorsal vertebrae will be evaluated with the 4 degrees of postero-anterior slippage, and the pain at each vertebral level is recorded. Then, Afterwards, it will treat during the most painful vertebra previously detected.

• Myofascial approach: After the bibliographic review of myofascial therapy treatments in fibromyalgia patients based on the articles by CastroSánchez AM et al., and an expert consensus, the following approach was decided: patients would have 4 sessions in total with 1 session per week of 30 minutes each.

• Transverse planes in the thoracolumbar fascia (TCL) and abdomen: Performing a myofascial induction as described by Pilat.
• Transverse planes at C7-D3 and sternum: Performing a myofascial induction as described by Pilat.
• Suboccipital inhibition: Performing a myofascial induction as described by Pilat

This will be classified as a continuous numerical variable measured by the Widespread Pain Index (WPI). In this index, the patient has to mark with an x the areas in which he/she has presented pain during the last week

This variable will be classified as a continuous numerical variable, measured by the Symptom Severity Index (SSI/SS-Score), composed of two subscales (SS-1 and SS-2) that assess the intensity during the last week of 3 of the main symptoms present in FM (fatigue, unrefreshing sleep and cognitive disorders), as well as the presence/absence of other common symptoms, respectively. The total score of the SSS is the sum total and ranges from 0 to 12. The SSS correlated correlates strongly with the WPI (r=0.733) and with the presence of Tender Points (r=0.680)

Another measurement variable will be the impact of fibromyalgia on quality of life, through the Fibromyalgia Impact Questionnaire (FIQ), a tool translated into Spanish by means of the international translation-retrotranslation recommendations, and whose reliability, validity, adaptation and sensitivity to change have been satisfactorily analyzed in Spanish patients with fibromyalgia. Consists of 19 items that measure three main categories (a) "function" - ten items that as-sess the participant's physical functions that address the participant's ability to perform each activity. This domain is assessed on a 4-point Likert scale, from 0 to 3 (0= always, 1= always, 1= always, 2= always, 3= always). 0 to 3 (0= always, 1= frequently, 2= occasional-ly, 3= never). (b) "Global impact" - composed of two items assessing the number of days in the last week when the participants felt good and the number of days they could not work due to FM symptoms

For this purpose, we will use the Tampa Kinesiophobia Scale (TSK), also translated and validated in Spanish. It is a 17-item self-report measure that will be used to measure fear of movement. A high score indicates an extreme fear of movement, while a low score indicates a negligible fear of movement.