Inclusion Criteria:  Meet the Budapest criteria for the clinical diagnosis of CRPS type I. Age between 18 and 65. Period between 0 and 6 months after the onset of the clinical picture. Have signed the informed consent of their own free will.  Exclusion Criteria:  Have a diagnosis of CRPS type II. Present type I CRPS in more than one limb. Patients who have suffered a recurrence of CRPS type I. Pregnancy or plans for it during the study. Previous sympathectomy in the affected limb.