| UPDATED: 15:13, Fri, Jan 15, 2021
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Affecting around 400,000 adults in the UK, symptoms of rheumatoid arthritis can progressively become worse - and quickly. However, two early indicators of the disease could lead to an early diagnosis and effective treatment. The disease causes inflammation when the immune system attacks the lining of the joints - otherwise known as the synovium. The Arthritis Foundation explained that the inflamed synovium becomes thicker.