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The most common form of psoriatic arthritis involves the small joints of fingers and toes, but other joints such as the ankles, jaw, spine can be affected, too.
There doesn't seem to be a link between the severity of skin psoriasis and the risk of developing arthritis, and why some people develop it and others do not is not fully understood. There does seem to be a genetic link, however, as up to half of people with psoriatic arthritis have a family history of the condition.
The symptoms of psoriatic arthritis are similar to those of other inflammatory joint conditions such as rheumatoid arthritis. In psoriatic arthritis, affected joints become tender, swollen, painful and stiff, especially on waking in the morning. Tendons which bind muscles to bone are lubricated by a synovial membrane and can become inflamed, too, causing muscle tenderness especially around the elbows, wrists and heels. In severe cases, joints may lose their range of movement and become misshapen or locked, although this is less common thanks to the development of powerful new disease-modifying drugs.
Fatigue is another common problem associated with inflammation, and you may feel exhausted or tired most of the time. Researchers do not know exactly what causes persistent fatigue, but it seems to be linked with increased levels of immune complexes and other inflammatory substances in the body.
Some people with psoriatic arthritis notice pitting (small dimples) on their nails, or nail thickening and discoloration. Inflammation of a part of the eye (uveitis or iritis) can also lead to pain and redness of one or both eyes which needs immediate medical treatment.
Psoriatic arthritis is a long-term (chronic) problem in which symptoms tend to flare up from time to time. Several different types of drugs are used to help control symptoms, such as non-steroidal-anti-inflammatory drugs, corticosteroid injections into, or around, a single painful joint, and disease-modifying drugs (e.g. methotrexate) which switch off the immune reactions that are causing inflammation and pain. New treatments, known as biological drugs, block the effects of immune substances, such as TNF alpha, to help reduce damage to joints and to reduce symptoms.
If you have received a diagnosis of psoriatic arthritis, a number of diet and lifestyle approaches may help.
Aim to lose any excess weight by following a healthy, balanced diet to relieve inflammation throughout the body and reduce strain on weight-bearing joints. A Mediterranean style diet providing plenty of fruit and vegetables is especially helpful.
Take regular, gentle exercise to help reduce muscle weakness and joint stiffness. If inflammation makes you feel more tired than usual, take regular rests. Always rest severely inflamed joints.
Your doctor can refer you to a physiotherapist who specialises in arthritis, who can show you:
An occupational therapist can suggest ways to make life easier using aids such as wrist splints, blocks to raise your chair, a raised toilet seat with arm rests, rails, long or thick-handled tools, a stick, stocking helpers or modified shoes for example.
Psoriatic arthritis has a significant effect on your quality of life and, not surprisingly, can leave you feeling anxious and depressed. If you are experiencing problems, or feel low in yourself, it's important to see your doctor so they can help you find solutions.
New treatments are available, and you may benefit from a review of your medication if pain or fatigue are interfering with your mobility or ability to function as well as you would like.
If you’re interested in learning more about how to keep your joints healthy, select Joints from the Your health menu above.
Dr Sarah Brewer is Healthspan's Medical Director and holds degrees in Natural Sciences, Surgery and Medicine from the University of Cambridge. Having worked as a GP and hospital doctor, Dr Sarah now holds an MSc in Nutritional Medicine from the University of Surrey and specialises in nutrition. She is also an award-winning writer and author.
Nothing beats a healthy, balanced diet to provide all the nutrients we need. But when this isn't possible, supplements can help. This article isn't intended to replace medical advice. Please consult your healthcare professional before trying supplements or herbal medicines.
2NHS, Psoriatic arthritis
3Kristensen, S et al. (2018). Beneficial effect of n-3 polyunsaturated fatty acids on inflammation and analgesic use in psoriatic arthritis: a randomized, double blind, placebo-controlled trial, Scandinavian Journal of Rheumatology
4Petho, Z et al (2015). Vitamin D status in men with psoriatic arthritis: a case-control study, Osteoporosis International 26(7):1965-70