The short answer
Sudden severe joint pain with swelling, restricted movement or feeling unwell needs urgent medical assessment. Septic arthritis is a joint infection that requires prompt treatment. Fever may be absent, so its absence does not make waiting safe.
Understanding the problem
Symptoms often develop quickly and usually affect one joint. Infection can damage the joint if treatment is delayed. Recent joint surgery, an artificial joint and some medical conditions increase concern, but infection can occur without these factors.
Care and next steps
Hospital assessment may lead to antibiotics and drainage of infected joint fluid. The exact plan depends on the findings. Do not assume a hot swollen joint is simply a flare of an existing condition or request an injection before it has been assessed.
Prepare for your consultation
Go for urgent assessment rather than waiting for the routine clinic schedule on this website. Tell the team when the pain began, about recent procedures and any medicines that affect immunity. Bring an implant card or operation summary if immediately available. After treatment, ask who will monitor recovery and explain the rehabilitation plan before returning to demanding activities.
Common questions
Does no fever rule out septic arthritis?
No. Severe sudden joint symptoms still require urgent assessment.
Medical sources & further reading
This patient education guide was approved for publication by Dr Shahrukh Khan on 11 September 2026. It cannot diagnose your symptoms or replace a personalised clinical assessment. Editorial policy · About the doctor.