Which knuckles are which
- MCP joints: the big knuckles where the fingers join the hand.
- PIP joints: the middle knuckles of the fingers.
- DIP joints: the small knuckles nearest the fingertips.
Different conditions tend to affect different knuckles, which helps narrow down the cause.
Osteoarthritis
Hand osteoarthritis commonly affects the DIP and PIP joints and the base of the thumb. It causes aching after use, stiffness for less than half an hour in the morning, and bony swellings: Heberden’s nodes near the fingertips and Bouchard’s nodes at the middle knuckles. It is more common in women and after 50.
See thumb pain.
Rheumatoid arthritis
Rheumatoid arthritis typically affects the MCP and PIP joints on both hands, with soft, warm swelling and stiffness that lasts more than 30 minutes in the morning. Fatigue and feeling unwell are common. Early diagnosis and treatment with disease-modifying medicines protect the joints from damage.
Psoriatic arthritis and gout
- Psoriatic arthritis: swelling of a whole finger (sausage finger), nail pitting and psoriasis.
- Gout: sudden, intense pain, redness and heat, often overnight.
- Lupus and other conditions: joint pain with rashes, fatigue or fever.
See diet for gout.
Injuries
- Sprains: ligament injury from bending a finger the wrong way.
- Dislocations: visible deformity, need prompt reduction.
- Boxer’s fracture: break of the bone behind the little finger knuckle after punching.
- Boxer’s knuckle: damage to the tissue holding the tendon over the big knuckle, causing pain and the tendon slipping.
See sprained finger.
Overuse and tendons
Repetitive gripping, typing, climbing and manual work can irritate tendons and joints. Trigger finger causes pain at the base of the finger with catching or locking.
See hand tendonitis and trigger finger.
Infection
A cut or bite over a knuckle, including a “fight bite” from a tooth, can carry bacteria deep into the joint. This can cause a serious joint infection and needs urgent medical assessment, even if the wound looks small.
Does knuckle cracking cause pain?
Habitual knuckle cracking is not linked to arthritis in studies. Cracking that is painful, or associated with swelling or weakness, should be assessed.
See joint popping.
Diagnosis
A clinician examines which joints are affected, swelling, warmth and movement. Blood tests check for inflammation and markers of rheumatoid arthritis, and uric acid for gout. X-rays and ultrasound show joint damage, fractures and inflammation.
Self-care
- Rest painful joints during flare-ups.
- Ice for swelling after injury; warmth for stiffness.
- Painkillers such as paracetamol or anti-inflammatory gels.
- Use larger handles and avoid tight gripping.
- Remove rings if fingers are swelling.
Hand exercises
- Make a fist: gently curl the fingers, then straighten, 10 times.
- Tendon glides: move through a hook fist, full fist and straight fist.
- Finger lifts: with the hand flat, lift each finger in turn.
- Thumb opposition: touch the thumb to each fingertip.
- Putty squeeze: for grip strength when pain allows.
Warm water before exercising can ease stiffness.
Splints and joint protection
Splints rest inflamed joints, support injured fingers and reduce strain. Hand therapists teach joint protection techniques and recommend gadgets that reduce load during daily tasks.
Medical treatment
Inflammatory arthritis is treated with disease-modifying medicines, sometimes with steroid injections. Gout attacks are treated with anti-inflammatory medicines and prevented with urate-lowering treatment. Fractures and some ligament injuries need splinting or surgery.
When to see a doctor
- A bite or cut over a knuckle: seek urgent care.
- A visibly deformed or dislocated finger.
- Hot, red, very painful swelling with fever.
- Swelling and morning stiffness lasting over 30 minutes.
- Pain or swelling lasting more than 2 weeks.
Key points to remember
- Knuckle pain often comes from arthritis or injury.
- Which knuckles hurt and morning stiffness give clues.
- Exercises, splints and joint protection help.
- Swollen, stiff knuckles need medical assessment.
Questions about knuckle pain
These answers are general information and do not replace an examination or individual medical advice.
What causes knuckle pain without injury?
Often osteoarthritis, rheumatoid arthritis, gout or overuse.
Why are my knuckles swollen?
Inflammation from arthritis, injury or infection.
Is knuckle pain a sign of rheumatoid arthritis?
It can be, especially with swelling and long morning stiffness on both hands.
What is boxer’s knuckle?
Damage to tissue holding the tendon over the big knuckle.
Does cracking knuckles cause arthritis?
Studies have not found a link.
Should I use heat or ice?
Ice for new injuries and swelling; heat for stiffness.
Can exercises help knuckle pain?
Yes, gentle exercises maintain movement and strength.
Why do my knuckles hurt in the morning?
Morning stiffness is common in arthritis; long stiffness suggests inflammation.
Why is a cut over the knuckle dangerous?
It can carry bacteria into the joint and cause infection.
When should I see a doctor?
For swelling, deformity, bites or pain lasting over 2 weeks.
Sources
This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.