Polyarthritis is a term used to describe arthritis that affects five or more joints simultaneously. It is not a specific type of arthritis, but rather a diagnosis that means multiple joints have arthritis at the same time. Polyarthritis can be caused by many conditions, including autoimmune diseases and infections. Some of the autoimmune disorders that can cause polyarthritis include rheumatoid arthritis, amyloidosis, psoriatic arthritis, and lupus erythematosus. Infections that can cause polyarthritis include chikungunya virus, Ross River virus, and Sindbis virus.

Symptoms of polyarthritis can include pain, stiffness, swelling, and movement restriction in the affected joints. The symptoms can be similar to those of rheumatoid arthritis and can develop over a period of many months or have a sudden onset. Polyarthritis can present as acute episodes or become chronic, lasting for more than six weeks.

Treatment for polyarthritis involves managing symptoms and reducing inflammation. Medications such as nonsteroidal anti-inflammatory drugs (NSAIDs) can reduce inflammation and relieve pain by blocking enzymes and proteins that contribute to inflammation. Stretching, swimming, and other forms of exercise can also be helpful in treating symptoms of polyarthritis. Warm baths and warming mitts may also help manage pain caused by arthritis.

In conclusion, polyarthritis is a type of arthritis that affects five or more joints simultaneously and can be caused by autoimmune disorders and infections. Symptoms can include pain, stiffness, swelling, and movement restriction in the affected joints. Treatment involves managing symptoms and reducing inflammation through medication and exercise.