Gout or joint infection? Understanding the difference

Gout produces inflammation when crystals activate the immune response inside a joint. A joint infection occurs when germs enter the joint and can worsen quickly. Both may cause pain, heat, redness, swelling, and difficulty moving. Fever may occur with infection, but its absence does not safely rule infection out. A clinician may need to examine the joint and test joint fluid for crystals and germs; blood tests or imaging may also help. Do not assume a familiar gout pattern is harmless if this episode feels different.

The [Gout](/conditions/gout/) page explains the underlying condition. Tell the clinician about [Chronic Kidney Disease](/conditions/chronic-kidney-disease/) or other conditions that affect treatment choices.

Contact a healthcare professional promptly for a new hot, swollen joint, especially if pain is severe or movement is restricted. Keep the joint rested and avoid squeezing, massaging, or puncturing the skin. Take only medicines already recommended for you, and do not use leftover antibiotics. If you have a prescribed flare plan, ask whether it is appropriate while infection is being considered. Note when symptoms began, whether they are spreading, and any recent wound, injection, surgery, or illness.

Seek emergency care for fever with confusion, faintness, rapid breathing, severe weakness, or rapidly spreading redness. Same-day assessment is needed for a hot swollen joint with chills, pus, a wound nearby, or pain that is escalating. Infection can threaten joint function and needs treatment chosen by a clinician.

Ask whether joint fluid should be tested, how infection will be excluded, and which pain treatment is safe with your medicines. Ask when to return if symptoms worsen and how future [Joint Swelling](/symptoms/joint-swelling/) should be assessed. Mention [Obesity](/conditions/obesity/) if relevant to your care.