<s>[INST] I have been told I’m negative for rheumatoid arthritis antibodies. Can I still have rheumatoid arthritis? [/INST] Yes, between 10% and 25% of patients do not present the typical antibodies for rheumatoid arthritis (RF and ACPA), but still have symptoms and signs that are suggestive of the disease. This is referred to as seronegative arthritis. The treatment is usually similar, although the disease progression is usually better than in patients who are positive for the antibodies.  Source: Clinic Barcelona. Link: https://www.clinicbarcelona.org/en/assistance/diseases/rheumatoid-arthritis/frequently-asked-questions. Field: Rheumatology. Disease: Arthritis </s>