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A cervical rib is an extra rib that forms above the first rib, growing from the base of the neck just above the collarbone.
You can have a cervical rib on the right, left, or on both sides. It may be a fully-formed bony rib or just a thin strand of tissue fibres.
A cervical rib is an abnormality that's present from birth. It doesn't usually cause problems, but if it presses on nearby nerves and blood vessels, it can cause neck pain, numbness in the arm and other symptoms, which collectively are known as thoracic outlet syndrome.
Thoracic outlet syndrome usually starts between 20 and 50 years of age, and is more likely to affect men than women.
Not all people with a cervical rib develop thoracic outlet syndrome, and the syndrome can also be caused by other conditions.
Symptoms of thoracic outlet syndrome include:
These symptoms vary widely from person to person. They may be constant or come and go.
If you have thoracic outlet syndrome, your GP may refer you for physiotherapy. Shoulder exercises can help stretch and strengthen the neck area and correct poor posture. Massage may also help to release any tight or shortened neck tissues.
To relieve any pain and swelling, your GP may prescribe a non-steroidal anti-inflammatory drug (NSAID), such as naproxen or diclofenac.
If you develop blood clots you may be prescribed thrombolytics to break them up, and anticoagulants to prevent further clots developing.
If these treatments don't help, surgery may be an option.