The principal symptoms of rheumatoid arthritis are joint pain, swelling and stiffness caused by inflammation of the synovial lining. Symptoms often develop gradually over several weeks, although some people experience a more rapid onset. RA commonly begins in the small joints of the hands and feet and frequently affects corresponding joints on both sides of the body, although the pattern is not always symmetrical.
Pain is often aching or throbbing and can be worse in the morning or after periods of inactivity. Swollen joints may feel warm and tender because of active inflammation. Unlike osteoarthritis, RA is an inflammatory systemic disease, so symptoms can extend beyond the joints and may include fatigue, fever, sweating, poor appetite and weight loss.
Morning stiffness is one of the most useful clinical characteristics of RA. Inflamed joints can remain stiff for a prolonged period after waking, making it difficult to move the hands, stand up, walk or perform ordinary tasks. RA-associated stiffness commonly persists longer than the approximately 30-minute period often associated with uncomplicated osteoarthritis.
The reason is that inflammatory fluid and cellular activity accumulate within and around affected joints during periods of inactivity, although the exact relationship between inflammatory biology and subjective stiffness is complex. Prolonged morning stiffness is not diagnostic by itself, because other inflammatory diseases can produce similar symptoms, but it is an important clue when combined with swelling, pain and an appropriate distribution of affected joints.
Joint swelling in RA results primarily from inflammation and thickening of the synovial tissue, together with increased fluid within the joint and changes in surrounding structures. An affected joint may feel soft or boggy when examined, warm to the touch and tender when pressure is applied. Persistent inflammation can eventually produce structural damage to cartilage and bone, which may cause deformity and loss of normal alignment.
The hands are particularly important because inflammation can interfere with grip and fine motor function. A person may have difficulty fully bending the fingers, making a fist, opening containers or carrying objects. Firm rheumatoid nodules can also form beneath the skin around affected joints in some people.
RA often has a symmetrical pattern, particularly once established, so pain and swelling may occur in corresponding joints on both sides of the body. Commonly affected sites include the wrists, knuckles, finger joints and forefoot joints, but knees, ankles, elbows, shoulders and other synovial joints can also become involved. The distribution is not invariably symmetrical, particularly in early disease, so absence of symmetry does not exclude RA. The distinction from osteoarthritis is also imperfect because OA can affect several joints, while RA can coexist with OA. Diagnosis therefore depends on the overall pattern, inflammatory signs, duration, examination findings, laboratory results and, when appropriate, imaging rather than a single symptom or joint.
General symptoms can be prominent because RA involves systemic inflammation. Fatigue and lack of energy are common and may persist even when joint symptoms fluctuate. Some people experience low-grade fever, sweating, reduced appetite or unintended weight loss. These symptoms can result from inflammatory signalling and may be more pronounced during active disease. Their presence can help distinguish inflammatory arthritis from purely mechanical joint disorders, although they are nonspecific and can occur with infections and other illnesses. Systemic symptoms are particularly important when assessing a new presentation because they indicate that the problem may involve more than an isolated painful joint.
RA can produce symptoms outside the joints because autoimmune inflammation may affect other tissues. Dry eyes can occur, and inflammatory disease may involve the lungs or heart and produce respiratory or chest symptoms. Rheumatoid nodules are another extra-articular manifestation and may develop under the skin, especially around pressure points. Long-standing inflammatory disease is also associated with increased cardiovascular risk.
These manifestations mean that RA is more accurately regarded as a systemic autoimmune disease with prominent joint involvement than as a disorder confined to cartilage and bones. NHS guidance notes that inflammation can affect areas such as the lungs, heart and eyes and that RA is associated with increased risks of heart attack and stroke.
Flares are periods when RA symptoms become more intense. During a flare, pain, swelling, stiffness and fatigue may increase, and ordinary activities can become more difficult. Disease activity can vary substantially between individuals and over time. Some people achieve prolonged periods of low disease activity or remission with effective treatment, while others experience more persistent inflammation. A temporary improvement does not necessarily mean that the autoimmune process has permanently resolved.
Modern treatment aims to reduce inflammatory activity sufficiently to prevent cumulative structural damage, making symptom tracking and regular clinical assessment important. NHS guidance states that RA can have flare-ups and that appropriate treatment can reduce the frequency of flares and minimise or prevent long-term joint damage.
Several other diseases can produce joint pain and stiffness, so RA symptoms should be interpreted in context. Osteoarthritis tends to produce more activity-related pain and shorter-lived stiffness, gout often causes sudden severe inflammation in a single joint, and septic arthritis can produce a hot swollen joint accompanied by systemic illness. Persistent swollen joints, prolonged morning stiffness, symmetrical small-joint symptoms or unexplained systemic symptoms warrant medical assessment.
NHS guidance stresses the importance of early diagnosis because timely treatment can reduce the risk of permanent joint damage. No single symptom establishes RA, and blood tests cannot definitively prove or exclude it; clinicians combine symptoms, examination, laboratory evidence and sometimes imaging to determine the diagnosis.
