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Like psoriasis, psoriatic arthritis is a long-term condition that can get progressively worse. In severe cases, there's a risk of the joints becoming permanently damaged or deformed, which may require surgical treatment.
However, with an early diagnosis and appropriate treatment, it's possible to slow down the progression of the condition and minimise or prevent permanent damage to the joints.
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The pain, swelling and stiffness associated with psoriatic arthritis can affect any joint in the body, but the condition often affects the hands, feet, knees, neck, spine and elbows.
The severity of the condition can vary considerably from person to person. Some people may have severe problems affecting many joints, whereas others may only notice mild symptoms in one or two joints.
There may be times when your symptoms improve (known as remission) and periods when they get worse (known as flare-ups or relapses).
Relapses can be very difficult to predict, but can often be managed with medication when they do occur.
See your GP if you experience persistent pain, swelling or stiffness in your joints – even if you haven't been diagnosed with psoriasis.
If you've been diagnosed with psoriasis, you should have check-ups at least once a year to monitor your condition. Make sure you let your doctor know if you're experiencing any problems with your joints.
Between one and two in every five people with psoriasis develop psoriatic arthritis.
It usually develops within 10 years of psoriasis being diagnosed, although some people may experience problems with their joints before they notice any symptoms affecting their skin.
Like psoriasis, psoriatic arthritis is thought to occur as a result of the immune system mistakenly attacking healthy tissue.
However, it's not clear why some people with psoriasis develop psoriatic arthritis and others don't.
If your doctor thinks you may have arthritis, they should refer you to a rheumatologist (a specialist in joint conditions) for an assessment.
The British Association of Dermatologists website has information on the psoriasis epidemiology screening tool (PEST) (PDF, 209kb). This is a questionnaire you may be asked to fill out, which helps your doctor decide if you need a referral. People with psoriasis should be asked to fill this out annually.
A rheumatologist will usually be able to diagnose psoriatic arthritis if you have psoriasis and problems with your joints.
A number of tests may be carried out to help confirm a diagnosis, including:
The main aims of treatment will be to relieve your symptoms, slow the progression of the condition and improve your quality of life.
For most people, this involves trying a number of different medications, some of which can also treat the psoriasis. Ideally, you should take one medication to treat both your psoriasis and psoriatic arthritis whenever possible.
The main medications used to treat psoriatic arthritis are summarised below and include:
Your GP may first prescribe non-steroidal anti-inflammatory drugs (NSAIDs) to see if they help relieve pain and reduce inflammation.
There are two types of NSAIDs and they work in slightly different ways:
Like all medications, NSAIDs can have side effects. Your doctor will take precautions to reduce the risk of these, such as prescribing the lowest dose necessary to control your symptoms for the shortest time possible.
If side effects do occur, they usually affect the stomach and intestines, and can include indigestion and stomach ulcers. A medication called a proton pump inhibitor (PPI) will often be prescribed alongside NSAIDs – a PPI helps protect your stomach by reducing the amount of acid it produces.
Read more about the side effects of NSAIDs.
If NSAIDs alone aren't helpful, some of the medications below may be recommended.
Like NSAIDs, corticosteroids can help reduce pain and swelling.
If you have a single inflamed or swollen joint, your doctor may inject the medication directly into the joint. This can offer rapid relief with minimal side effects, and the effect can last from a few weeks to several months.
Corticosteroids can also be taken as a tablet, or as an injection into the muscle, to help lots of joints. However, doctors are generally cautious about this because the medication can cause significant side effects if used in the long term, and psoriasis can flare up when you stop using it.
Disease-modifying anti-rheumatic drugs (DMARDs) are medications that work by tackling the underlying causes of the inflammation in your joints.
They can help to ease your symptoms and slow the progression of psoriatic arthritis. The earlier you start taking a DMARD, the more effective it will be.
Leflunomide is often the first drug given for psoriatic arthritis, although sulfasalazine or methotrexate may be considered as alternatives.
It can take several weeks or months to notice a DMARD working, so it's important to keep taking the medication, even if it doesn't seem to be working at first.
Biological treatments are a newer form of treatment for psoriatic arthritis. You may be offered one of these treatments if:
Biological drugs work by stopping particular chemicals in the blood from activating your immune system to attack the lining of your joints.
Some of the biological medicines you may be offered include:
The most common side effect of biological treatments is a reaction in the area of skin where the medication is injected, such as redness, swelling or pain, although these reactions aren't usually serious.
However, biological treatments can sometimes cause other side effects, including problems with your liver, kidneys or blood count, so you'll usually need to have regular blood or urine tests to check for these.
Biological treatments can also make you more likely to develop infections. Tell your doctor as soon as possible if you develop symptoms of an infection, such as:
Biological medication will usually be recommended for three months at first, to see if it helps. If it's effective, the medication can be continued. Otherwise, your doctor may suggest stopping the medication or swapping to an alternative biological treatment.
There's not enough scientific evidence to say that complementary therapies, such as balneotherapy (bathing in water containing minerals), works in treating psoriatic arthritis.
There's also not enough evidence to support taking any kind of food supplement as treatment.
Complementary therapies can sometimes react with other treatments, so talk to your GP, specialist or pharmacist if you're thinking of using any.
As with psoriasis and other types of inflammatory arthritis, you may be more likely to get some other conditions – such as cardiovascular disease (CVD) – if you have psoriatic arthritis. CVD is the term for conditions of the heart or blood vessels, such as heart disease and stroke.
Your doctor should carry out tests each year (such as blood pressure and cholesterol tests) so they can check whether you have CVD and offer additional treatment, if necessary.
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As well as your GP and a rheumatologist, you may also be cared for by: