Psoriatic arthritis

Also called PsA

Psoriatic arthritis is a type of long-term arthritis that develops in some people with the skin condition psoriasis. It causes joints and tendons to become painful, stiff and swollen. It usually develops within 10 years of psoriasis starting, but it can come first.

Last updated Nov 9, 2026

What it is

Symptoms often come and go in flare-ups. Without treatment, it can damage joints over time.

Treatment includes anti-inflammatory medicines, steroid injections, and medicines that calm the immune system, such as methotrexate or biological treatments.

Common signs

  • Painful, swollen joints
  • Stiffness, especially in the morning
  • A whole finger or toe swelling up
  • Pain in the heel or sole
  • Changes to the nails
  • Tiredness

How it is usually diagnosed

  • Examination by a rheumatologist
  • Blood tests to rule out other types of arthritis
  • X-rays, ultrasound or MRI

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Rheumatology letters
  • Blood test results, including monitoring for medicines
  • X-ray and scan reports
  • Medicine lists

Questions to ask your doctor

  • Which treatment is best for my skin and joints together?
  • How often will I need blood tests?
  • What should I do during a flare-up?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • A single hot, red, swollen joint with a fever, or signs of infection while on immune-suppressing medicine: get urgent help the same day

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources