Psoriatic arthritis differential diagnosis

Axial spondyloarthritis (axSpA) is a long‑term inflammatory condition that mainly affects the spine and sacroiliac joints (the joints at the base of the spine). It causes back pain, stiffness, and discomfort, especially after rest. Axial spondyloarthritis is not contagious, and many people find their symptoms improve with movement and supportive care.

Axial spondyloarthritis happens when the immune system causes inflammation in the spine and nearby joints. This inflammation can make the back feel stiff, sore, or difficult to move, particularly first thing in the morning or after sitting still.

Common signs include:

• Lower‑back or buttock pain, often deep and hard to pinpoint
• Morning stiffness lasting more than 30 minutes
• Pain that worsens with rest and improves with gentle movement
• Night‑time pain, especially in the second half of the night
• Difficulty bending, twisting, or standing upright
• Pain that may spread into the hips or thighs

Symptoms may come and go, and can vary depending on inflammation levels.

Why axial spondyloarthritis matters in psoriatic disease

Axial spondyloarthritis is important to recognise because:

• It is part of the same family of conditions as psoriatic arthritis.
• Some people with psoriatic arthritis develop back or buttock pain that is actually axial involvement.
• Back pain from axSpA can be mistaken for mechanical back pain, sciatica, or strain.
• People with psoriasis may worry that new back symptoms mean their condition is worsening.
• AxSpA can occur alongside enthesitis, sacroiliitis, and peripheral joint symptoms.
• Understanding axSpA helps people feel more confident about what’s happening in their spine and when to seek advice.

What can I do about it?

Axial spondyloarthritis is manageable, and many people find their symptoms improve with supportive strategies. A healthcare professional can help confirm the diagnosis and discuss suitable options.

General approaches often include:

• Gentle movement, especially after rest
• Pacing activities to avoid long periods of sitting or standing
• Warm or cool compresses to soothe discomfort
• Supportive posture, such as avoiding slumping
• Gentle stretching, if advised by a clinician

Where can I get help?

If you’re unsure whether your symptoms are axial spondyloarthritis, psoriatic‑related, or something else or if back pain is affecting daily life support is available.

You can:

• Speak to your GP
• Ask for a referral to rheumatology if symptoms are persistent
• Request a review of your psoriasis or psoriatic arthritis care plan if you’re concerned about overlapping symptoms.

Fibromyalgia is a long‑term pain condition that causes widespread discomfort, fatigue, and sleep difficulties. It affects how the nervous system processes pain, making everyday sensations feel more intense. Fibromyalgia is not contagious, and many people find their symptoms improve with supportive care and self‑management strategies.

Fibromyalgia is thought to involve changes in how the brain and nerves interpret pain signals. This can lead to persistent aches, tenderness, and tiredness, even without obvious inflammation or injury.

Common signs include:

• Widespread pain affecting multiple areas of the body
• Fatigue, even after rest
• Poor or unrefreshing sleep
• Tender points that feel sore when pressed
• Brain fog, such as difficulty concentrating
• Sensitivity to touch, temperature, or noise

Symptoms can vary from day to day and may flare during stress, illness, or poor sleep.

Why it is relevant to psoriatic disease

Fibromyalgia matters in psoriatic disease because:

• It can be mistaken for psoriatic arthritis, especially when pain is widespread or persistent.
• People with psoriasis may worry that new aches mean their condition is worsening.
• Fibromyalgia can co‑exist with psoriatic arthritis, making symptoms feel more intense.
• Fatigue from fibromyalgia may overlap with tiredness experienced during psoriatic disease.
• Understanding fibromyalgia helps people feel more confident about what’s happening in their body and when to seek advice.

What can I do about it?

Fibromyalgia is manageable, and many people find their symptoms improve with supportive strategies. A healthcare professional can help confirm the diagnosis and discuss suitable options.

General approaches often include:

• Gentle movement, such as walking or stretching
• Pacing activities to avoid over‑exertion
• Relaxation techniques to support wellbeing
• Good sleep routines, if possible
• Warmth, such as baths or heat packs, to ease discomfort

Where can I get help?

If you’re unsure whether your symptoms are fibromyalgia, psoriatic‑related, or something else or if pain or fatigue are affecting daily life support is available.

You can:

• Speak to your GP
• Ask for a referral to rheumatology or pain management if symptoms are persistent
• Request a review of your psoriasis or psoriatic arthritis care plan if you’re concerned about overlapping symptoms.

Gout is a painful joint condition caused by a build‑up of uric acid crystals inside a joint. This can lead to sudden episodes of intense pain, swelling, and redness, often affecting the big toe but sometimes other joints. Gout is not contagious, and many people find their symptoms improve with the right care and support.

Gout occurs when uric acid levels in the body become high enough for sharp crystals to form inside a joint. These crystals trigger inflammation, causing the joint to become red, hot, swollen, and extremely painful.

Common signs include:

• Sudden, severe joint pain, often overnight
• Redness and warmth over the joint
• Swelling that may make the joint look enlarged
• Extreme tenderness, even to light touch
• Difficulty walking or using the affected joint

Symptoms often come in “attacks” that last hours to days.

Why it is relevant to psoriatic disease

Gout matters in psoriatic disease because:

• It can be mistaken for psoriatic arthritis, especially when a joint becomes red and swollen.
• People with psoriasis may worry that sudden joint pain means their condition is worsening.
• Gout can occur alongside psoriatic arthritis, making diagnosis more complex.
• Both conditions can affect the feet, ankles, and toes, leading to overlapping symptoms.
• Understanding gout helps people feel more confident about what’s happening in their joints and when to seek advice.

What can I do about it?

Gout is manageable, and many people find their symptoms improve with supportive strategies. A healthcare professional can help confirm the diagnosis and discuss suitable options.

General approaches often include:

• Resting the affected joint during painful periods
• Warm or cool compresses to soothe discomfort
• Gentle movement once pain begins to ease
• Pacing activities to reduce strain on the joint
• Supportive footwear, especially if the feet are affected

Where can I get help?

If you’re unsure whether your symptoms are gout, psoriatic‑related, or something else or if pain or swelling is affecting daily life support is available.

You can:

• Speak to your GP
• Ask for a referral to rheumatology if symptoms are persistent or unclear
• Request a review of your psoriasis or psoriatic arthritis care plan if you’re concerned about overlapping symptoms.

Osteoarthritis is a common joint condition where the protective cartilage in a joint gradually becomes thinner and less smooth. This can lead to pain, stiffness, and swelling, especially after activity or long periods of rest. Osteoarthritis is not contagious, and many people find their symptoms improve with supportive care and pacing.

Osteoarthritis happens when the cartilage that cushions a joint begins to wear down. Without this smooth surface, the joint may feel stiff, sore, or difficult to move. It often affects the hands, knees, hips, and spine, but can occur in any joint.

Common signs include:

• Joint pain, especially after activity
• Stiffness, particularly after resting
• Swelling around the joint
• Reduced movement or a feeling of “grinding”
• Pain that may ease with gentle movement

Symptoms can vary from day to day and may flare with activity, cold weather, or overuse.

Why it is relevant to psoriatic disease

Osteoarthritis matters in psoriatic disease because:

• It can be mistaken for psoriatic arthritis, especially in the hands or spine.
• Both conditions cause pain and stiffness, but for different reasons.
• People with psoriasis may worry that new joint symptoms mean their condition is worsening.
• Osteoarthritis can occur alongside psoriatic arthritis, making diagnosis more complex.
• Understanding osteoarthritis helps people feel more confident about what’s happening in their joints and when to seek advice.

What can I do about it?

Osteoarthritis is manageable, and many people find their symptoms improve with supportive strategies. A healthcare professional can help confirm the diagnosis and discuss suitable options.

General approaches often include:

• Gentle movement, such as walking or stretching
• Pacing activities to avoid over‑exertion
• Supportive footwear, especially for knee or hip symptoms
• Warmth, such as heat packs or warm baths
• Resting the joint during painful periods

Where can I get help?

If you’re unsure whether your symptoms are osteoarthritis, psoriatic‑related, or something else or if pain or stiffness is affecting daily life support is available.

You can:

• Speak to your GP
• Ask for a referral to rheumatology if symptoms are persistent or unclear
• Request a review of your psoriasis or psoriatic arthritis care plan if you’re concerned about overlapping symptoms.

Reactive arthritis is an inflammatory joint condition that can develop after an infection, often affecting the joints, eyes, or urinary system. It can cause pain, swelling, stiffness, and fatigue, and symptoms may come and go. Reactive arthritis is not contagious, and many people improve with the right medical care and support.

Reactive arthritis happens when the immune system becomes overactive in response to an infection commonly in the gut or urinary tract. Even after the infection settles, inflammation can continue in the joints or other parts of the body.

Common signs include:

• Joint pain or swelling, often in the knees, ankles, or feet
• Morning stiffness
• Fatigue
• Lower back pain
• Eye redness or discomfort
• Urinary symptoms, such as discomfort when passing urine

Symptoms can vary widely. Some people have mild joint pain, while others experience more noticeable inflammation.

Why it is relevant to psoriatic disease

Reactive arthritis is important to recognise because:

• It can look similar to psoriatic arthritis, especially when joints are swollen or stiff.
• Eye symptoms may resemble uveitis, which can also occur in psoriatic disease.
• People with psoriasis may worry that new joint pain is a psoriatic arthritis flare.
• Treatments differ what helps psoriasis or psoriatic arthritis may not treat reactive arthritis.
• Both conditions involve the immune system, so they can occasionally co‑exist.

Understanding reactive arthritis helps people with psoriatic disease feel more confident about what’s happening in their joints and when to seek advice.

What can I do about it?

Reactive arthritis is manageable, and many people find their symptoms improve with the right medical care. Because it can affect joints and sometimes the eyes or urinary system, it’s important to seek professional guidance.

General approaches often include:

• Gentle movement to keep joints comfortable
• Rest and pacing during flares
• Warm compresses for stiff joints
• Looking after general wellbeing, including sleep and stress management

Where can I get help?

If you’re unsure whether your symptoms are reactive arthritis, psoriatic‑related, or something else or if joint pain is worsening or affecting daily life support is available.

You can:

• Speak to your GP
• Ask for a referral to rheumatology
• Request a review of your psoriasis or psoriatic arthritis care plan if you’re concerned about overlapping symptoms
• Seek urgent medical advice if symptoms suddenly worsen.

Rheumatoid arthritis (RA) is an autoimmune condition that causes inflammation inside the joints, leading to pain, swelling, and stiffness. It most commonly affects the hands, wrists, and feet, but can involve many joints. RA is not contagious, and many people find their symptoms improve with the right care and support.

RA happens when the immune system mistakenly attacks the lining of the joints. This inflammation can make joints feel warm, swollen, and difficult to move, especially first thing in the morning.

Common signs include:

• Swollen joints, often in the hands or feet
• Morning stiffness lasting longer than 30 minutes
• Warmth or tenderness over the joint
• Fatigue or low energy
• Difficulty with everyday tasks, such as gripping or walking

Symptoms may come and go, and can vary depending on inflammation levels.

Why it is relevant to psoriatic disease

Rheumatoid arthritis matters in psoriatic disease because:

• It can be mistaken for psoriatic arthritis, especially when the hands are swollen or stiff.
• Both conditions cause joint inflammation, but they behave differently and may need different treatments.
• People with psoriasis may worry that new joint symptoms mean their condition is worsening.
• RA can occur alongside psoriatic arthritis, making diagnosis more complex.
• Understanding RA helps people feel more confident about what’s happening in their joints and when to seek advice.

What can I do about it?

Rheumatoid arthritis is manageable, and many people find their symptoms improve with supportive strategies. A healthcare professional can help confirm the diagnosis and discuss suitable options.

General approaches often include:

• Gentle movement, especially after rest
• Warmth, such as heat packs or warm baths
• Pacing activities to avoid over‑exertion
• Resting the joint during painful periods
• Supportive footwear, if the feet are affected

Where can I get help?

If you’re unsure whether your symptoms are rheumatoid arthritis, psoriatic‑related, or something else or if pain or stiffness is affecting daily life support is available.

You can:

• Speak to your GP
• Ask for a referral to rheumatology if symptoms are persistent or unclear
• Request a review of your psoriasis or psoriatic arthritis care plan if you’re concerned about overlapping symptoms.