The assessment of disease activity in AxSpA involves the use of objective inflammatory response (OIR) and patient reported outcomes (PROs). In clinics, a combination of OIR and PROs are used to measure disease activity and response to treatment. OIR includes measurements such as CRP and MRI inflammatory lesions. PROs include measurements for pain, fatigue and quality of life (QOL).

The prioritisation of pain, and its evaluation, is important in those with psoriatic arthritis, when the already incredibly heterogenous nature of the condition can complicate assessment. Whilst we lean towards all pain in PsA being nociceptive in nature, evidence suggests that a significant proportion of patients with PsA also have nociplastic pain, characterised by fibromyalgia.

Addressing chronic pain often leads general practitioners and specialists to prescribe opioids. However, opioids (weak and strong) have not demonstrated efficacy in long-term pain management; their chronic use could even worsen pain in users. Opioids prescription is often perceived as being safer than NSAIDs prescription, especially in respect to MACE.