<s>[INST] What does psoriatic arthritis mean? [/INST] Psoriatic arthritis is a type of arthritis that is extremely common. It is a condition that affects the joints and develops in people having psoriasis. Source: Mr. Med. Link: https://www.mrmed.in/health-library/rheumatology/frequently-asked-arthritis-questions. Field: Rheumatology. Disease: Arthritis </s>