Inclusion Criteria:  Having as mother tongue Spanish or a very high level in Spanish to understand the patient information sheet, the informed consent, as well as being able to follow the group intervention sessions and the homework. Diagnosis of some specific anxiety disorder, avoidant personality disorder, adjustment disorders with anxious/anxious-depressive symptomatology, as well as other unspecified anxiety disorders with clinical significance (negative impact of anxiety in valuable areas of the patient's life).  Exclusion Criteria:  Continuing individual psychotherapeutic treatment from the beginning of the group intervention until the end of it. Other diagnoses of severe mental disorder; cluster A or B personality disorder; and/or substance use disorder in the past 6 months. Diagnosis of intellectual disability, mild cognitive impairment or dementia. Changes in psychopharmacological treatment (in active ingredient or dose) in the month prior to the start of the group intervention. Diagnosis of uncontrolled or non-stabilized organic disease.