Swollen knuckles and finger joints: causes, red flags and when to get it checked

Finger joints swell when the lining of the joint is inflamed, when fluid builds up, or when bone overgrows. Which joints are affected and for how long stiffness lasts, together with whether other parts of the body are involved, help to separate wear-and-tear arthritis from autoimmune disease.

• Osteoarthritis (nodal): bony swellings of the end (Heberden) and middle (Bouchard) joints, often in the post-menopausal years, with stiffness that lasts under 30 minutes.

• Injury, sprain or recent overuse, with localised swelling.

• Rheumatoid arthritis: symmetrical swelling of the knuckles and wrists, morning stiffness over 30 minutes, tiredness, and tender, warm joints.

• Psoriatic arthritis: swollen sausage-like fingers, nail changes and skin psoriasis.

• Gout and pseudogout: sudden hot, red, intensely painful joints, sometimes in the fingers.

• Connective tissue diseases such as lupus and scleroderma, and hand eczema or infection.

• Septic arthritis, or infection of the tendon sheath, with fever and severe pain.

• Haemochromatosis (second and third knuckle arthritis) and other metabolic causes.

Swelling of several joints for more than six weeks, morning stiffness over 30 minutes, fatigue, a hot red swollen joint with fever, nail pitting or psoriasis, family history of autoimmune disease, dry eyes and mouth, or difficulty gripping suggests inflammatory disease needing prompt review.

• Same-day GP or A&E: a hot, red, swollen joint with fever or severe pain, or a swollen finger after an animal bite or wound.

• GP within days to a week or two: swollen joints with morning stiffness over 30 minutes, particularly in several joints.

• Urgent rheumatology referral: persistent inflammatory pattern lasting more than six weeks.

• Routine: bony lumps and stiffness that have slowly developed over years.

The doctor asks which joints, duration, morning stiffness, pain, fatigue, skin and nail changes, eye symptoms, family history and injuries. They examine the hands for swelling, warmth, tenderness, deformity, grip strength and range of movement, and check other joints, skin and nails.

• Blood tests: inflammatory markers (CRP, ESR), rheumatoid factor and anti-CCP antibodies, full blood count, and uric acid.

• Hand and foot X-rays: to look for erosions and arthritis pattern.

• Ultrasound of the joints: to detect inflammation early.

• Joint aspiration: if gout, pseudogout or infection is suspected.

• Iron studies and ferritin: if haemochromatosis is possible.

Keep the hands moving with gentle exercises, apply warmth for stiffness, and use jar openers and adaptations to reduce strain. Simple painkillers or topical anti-inflammatories can help osteoarthritis. Inflammatory arthritis needs prescribed disease-modifying treatment to prevent damage. Smoking cessation improves outcomes in rheumatoid arthritis.

The NHS route is a GP and rheumatology referral. Private rheumatology and hand therapy offer direct access to blood tests, ultrasound and treatment.