Psoriatic arthritis is an inflammatory joint condition that develops in some people with psoriasis, though it doesn’t always follow the pattern you’d expect. Skin symptoms can appear years before joint problems, joints can flare without any visible psoriasis at all, and the severity varies enormously from person to person. Getting an accurate diagnosis matters, since early treatment can help prevent lasting joint damage.

This guide explains what psoriatic arthritis is, how it relates to psoriasis, what the symptoms look like, how it’s diagnosed, and what treatment typically involves.

What Is Psoriatic Arthritis?

Psoriatic arthritis is a long-term, inflammatory form of arthritis that causes pain, swelling, and stiffness in the joints. It’s classed as an autoimmune condition, meaning it develops when the immune system, which normally protects against infection, mistakenly attacks healthy tissue around the joints.

Psoriatic arthritis is closely linked to psoriasis, a skin condition causing patches of red, flaky skin. Around 1 in 4 people with psoriasis go on to develop psoriatic arthritis, though the two conditions don’t always run in step. In most cases, skin symptoms appear first, sometimes by many years, before joint problems develop. In a smaller number of cases, joint symptoms appear at the same time as skin symptoms, and occasionally people develop psoriatic arthritis without ever having noticeable psoriasis at all.

Symptoms of Psoriatic Arthritis

Psoriatic arthritis can affect any joint in the body, and symptoms vary widely between individuals. Common signs include:

  • Joint pain, swelling, and stiffness, often worse first thing in the morning
  • Stiffness that tends to improve with movement and exercise
  • Swelling of entire fingers or toes, sometimes described as looking like a sausage
  • Pain and tenderness where tendons and ligaments attach to bone, such as the heel or sole of the foot
  • Changes to the nails, including pitting or separation from the nail bed
  • Fatigue alongside joint symptoms

Symptoms usually develop gradually, which means many people don’t immediately realise what’s happening, though in rarer cases they can appear suddenly. Severity ranges from mild symptoms in one or two joints to more widespread involvement across the body. As with other inflammatory arthritis conditions, symptoms often come and go in flares, with periods of remission in between.

What Causes Psoriatic Arthritis?

The exact cause of psoriatic arthritis isn’t fully understood, but it’s known to be an autoimmune condition, closely tied to the same immune processes that drive psoriasis. It’s not clear why some people with psoriasis go on to develop psoriatic arthritis while others don’t, though a few factors are associated with increased risk:

  • Family history: having a close relative with psoriasis or psoriatic arthritis increases risk
  • Having psoriasis: the strongest known risk factor, particularly more severe or widespread skin disease
  • Age: most commonly diagnosed between the ages of 30 and 50, though it can develop at any age

Having psoriasis doesn’t mean psoriatic arthritis is inevitable, and the two conditions don’t always track each other in severity. Persistent joint symptoms are what matter for diagnosis, regardless of how mild or significant your skin symptoms are.

How Is Psoriatic Arthritis Diagnosed?

Diagnosing psoriatic arthritis starts with a thorough clinical assessment. At a specialist rheumatology appointment, this typically involves:

  1. A detailed history: your joint symptoms, any history of psoriasis (even if it cleared up long ago), and family history of psoriasis or joint conditions.
  2. A full musculoskeletal examination: assessing affected joints, entheses (where tendons attach to bone), and any nail or skin changes.
  3. Blood tests, where clinically appropriate: not all patients need blood tests, but they can help rule out other forms of arthritis and check general inflammation markers.
  4. Imaging, if needed: ultrasound or X-ray can help assess joint and tendon involvement where the clinical picture needs further clarity.

Because psoriatic arthritis can closely resemble other types of inflammatory arthritis, a thorough assessment by an experienced rheumatologist is often the clearest way to reach an accurate diagnosis, particularly in cases where skin symptoms are mild, absent, or long resolved.

How Is Psoriatic Arthritis Treated?

There’s no cure for psoriatic arthritis, but treatment can effectively manage symptoms and reduce the risk of long-term joint damage for most people. Treatment approaches generally include:

  • Non-steroidal anti-inflammatory drugs (NSAIDs): used for milder symptoms, available as tablets, creams, or gels
  • Steroid injections: targeted directly into an affected joint to ease pain and inflammation
  • Disease-modifying anti-rheumatic drugs (DMARDs): used for moderate to severe symptoms, typically taking several months to show full effect
  • Biological treatments: usually given by injection and considered where DMARDs alone aren’t effective
  • Physiotherapy and occupational therapy: supporting joint function, mobility, and day-to-day activity

If a particular medicine isn’t working well for your symptoms, it’s worth flagging this at review, since another option may suit you better. Treatment is generally an ongoing process, adjusted over time based on how your symptoms respond.

Living With Psoriatic Arthritis

Managing psoriatic arthritis well usually involves more than medication alone. Alongside your treatment plan, many people find the following helpful:

  • Staying active within what your symptoms allow, since movement can ease stiffness
  • Maintaining a healthy weight, since extra load on weight-bearing joints such as hips and knees can worsen symptoms
  • Working with a physiotherapist or occupational therapist on joint-specific support
  • Keeping track of flare patterns to discuss at review appointments

Because psoriatic arthritis can also be associated with other conditions, including certain bowel and eye conditions, it’s worth mentioning any new or unusual symptoms to your rheumatologist, even if they seem unrelated to your joints.

Psoriatic Arthritis and Other Rheumatology Conditions

Psoriatic arthritis is one of several inflammatory joint conditions rheumatologists treat, and it’s often confused with related conditions that present in similar ways. A few worth distinguishing:

  • Rheumatoid arthritis: another autoimmune inflammatory arthritis, but without the link to psoriasis and typically affecting joints symmetrically
  • Ankylosing spondylitis: an inflammatory condition primarily affecting the spine, which shares some underlying mechanisms with psoriatic arthritis
  • Osteoarthritis: caused by mechanical wear on joints over time, rather than autoimmune inflammation
  • Gout: caused by a build-up of uric acid crystals in the joints, typically presenting as sudden, severe pain in a single joint

Because these conditions can overlap in how they present, particularly in the early stages, a specialist assessment is often the clearest route to an accurate diagnosis.

When to See a Rheumatologist

It’s worth seeking a specialist assessment if you have psoriasis and develop new joint pain, swelling, or stiffness, even if it seems minor. It’s equally worth being assessed if you have persistent joint symptoms alongside nail changes or entheseal pain, even without an obvious history of psoriasis. Earlier assessment generally means earlier treatment, and earlier treatment tends to produce better long-term outcomes.

Psoriatic Arthritis Care at Friends Medical Service

At Friends Medical Service, our rheumatology service covers psoriatic arthritis alongside a wide range of other joint, muscle, and autoimmune conditions, including rheumatoid arthritis, osteoarthritis, gout, and inflammatory spinal conditions such as ankylosing spondylitis. You’ll be seen by an experienced consultant rheumatologist who takes a thorough history and full musculoskeletal examination to reach a clinical diagnosis and build a management plan around you.

Where needed, blood tests and ultrasound imaging can be arranged quickly to support diagnosis, and referrals to physiotherapy are available where that forms part of your care. A referral is required to see our rheumatologist for a full assessment, with the exception of gout.

If you’re experiencing joint pain or stiffness, particularly alongside psoriasis, you can start with a GP appointment to discuss a referral, or contact our team directly to find out more.

Frequently Asked Questions

What are the early signs of psoriatic arthritis? Joint pain, swelling, and stiffness, particularly worse in the morning, along with swelling of whole fingers or toes and nail changes such as pitting are common early signs.

Can you have psoriatic arthritis without psoriasis? Yes. While most people develop skin symptoms first, some people develop joint symptoms before any visible psoriasis, and a small number never develop noticeable skin symptoms at all.

Will I need tests to diagnose psoriatic arthritis? Not always. A thorough history and clinical examination often provide enough information, though blood tests or imaging may be arranged where clinically appropriate.

How is psoriatic arthritis treated? Treatment ranges from anti-inflammatory medicines and steroid injections for milder symptoms to disease-modifying anti-rheumatic drugs and biological treatments for more significant disease, often alongside physiotherapy.

Is psoriatic arthritis the same as rheumatoid arthritis? No. Both are autoimmune, inflammatory forms of arthritis, but psoriatic arthritis is linked to psoriasis and can affect joints, tendons, entheses, and nails in ways rheumatoid arthritis typically doesn’t.

Do I need a referral to see a rheumatologist? Yes, a referral is generally required for a full rheumatology assessment, with the exception of gout, which doesn’t require one.

Can psoriatic arthritis be cured? There’s currently no cure, but early diagnosis and appropriate treatment can effectively manage symptoms and reduce the risk of long-term joint damage for most people.

Further Reading

For further, independent information on psoriatic arthritis, the following resources are a good place to start:

Final Thoughts

Psoriatic arthritis can affect people very differently, but with an accurate diagnosis and the right treatment plan, most people manage the condition well and stay active. If you have psoriasis and are experiencing new joint symptoms, or persistent joint pain without a clear explanation, getting assessed early gives you the best chance of staying ahead of the condition.

Learn more about our Rheumatology service or get in touch with our team to discuss your symptoms and next steps.