To be eligible for enrollment into the PREJAK Registry, a patient must satisfy all of the inclusion criteria and none of the exclusion criteria listed below.  Inclusion Criteria  The patient must be:  One of the following:  Diagnosis with rheumatoid arthritis (RA) and initiating (prescribed or starting) a Januse Kinase inhibitors (JAKi) for the treatment of RA at the enrollment visit. Meet the ASAS criteria for axial spondyloarthritis (AxSpA), including radiographic or non-radiographic, and initiating (prescribe or starting) a JAKi for the treatment of AxSpA at the enrollment visit. Diagnosis with psoriatic arthritis (PsA) and initiating (prescribed or starting) a Januse Kinase inhibitors (JAKi) for the treatment of PsA at the enrollment visit. At least 18 years age or older Able and willing to provide written consent  Exclusion Criteria:  Patients who do not wish to participate or are unable to give informed consent