Print Overview Knee bursae Enlarge image Close Knee bursae Knee bursae Bursae are small fluid-filled sacs (shown in blue) that reduce friction between moving parts in your body's joints. Knee bursitis is inflammation or irritation of one or more of the bursae in your knee. Knee bursitis is inflammation of a small fluid-filled sac (bursa) situated near your knee joint. Bursae reduce friction and cushion pressure points between your bones and the tendons, muscles and skin near your joints. Any of the bursa in your knee can become inflamed, but knee bursitis most commonly occurs over the kneecap or on the inner side of your knee below the joint. Knee bursitis causes pain and can limit your mobility. Treatment for knee bursitis often includes a combination of self-care practices and doctor-administered treatments to alleviate pain and inflammation.Products & ServicesA Book: Mayo Clinic Book of Home RemediesA Book: Mayo Clinic Guide to ArthritisProducts for Mobility and SafetyShow more products from Mayo Clinic SymptomsKnee bursitis signs and symptoms vary, depending on which bursa is affected and what's causing the inflammation. In general, the affected portion of your knee might feel warm, tender and swollen when you put pressure on it. You might also feel pain when you move or even at rest. A sharp blow to the knee can cause symptoms to appear rapidly. But most cases of knee bursitis result from friction and irritation of the bursa that occurs in jobs that require a lot of kneeling on hard surfaces — so symptoms usually begin gradually and can worsen over time. When to see a doctor The bursa that lies over your kneecap can sometimes become infected. Call your doctor if you have a fever in addition to pain and swelling in your knee. Request an appointment There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. Click here for an email preview. Email ErrorEmail field is required ErrorInclude a valid email address Learn more about Mayo Clinic’s use of data. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. 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Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry CausesKnee bursitis can be caused by: Frequent and sustained pressure, such as from kneeling, especially on hard surfaces Overuse or strenuous activity A direct blow to your knee Bacterial infection of the bursa Complications from osteoarthritis, rheumatoid arthritis or gout in your knee Risk factorsKnee bursitis is a common complaint, but your risk of developing this painful disorder can increase from: Prolonged kneeling. People who work on their knees for long periods — carpet layers, plumbers and gardeners — are at increased risk of knee bursitis. Participation in certain sports. Sports that result in direct blows or frequent falls on the knee — such as wrestling, football and volleyball — can increase your risk of knee bursitis. Runners can develop pain and inflammation in the pes anserine bursa, situated on the inner side of your knee below the joint. Obesity and osteoarthritis. Pes anserine bursitis, affecting the inner side of your knee below the joint, often occurs in obese women with osteoarthritis. PreventionTo avoid knee bursitis or prevent its recurrence: Wear kneepads. If you're working on your knees or participating in sports that put your knees at risk, use padding to cushion and protect your knees. Take breaks. If you're on your knees for a period of time, take regular breaks to stretch your legs and rest your knees. Avoid excessive squatting. Excessive or repetitious bending of your knees increases the force on your knee joints. Achieve and maintain a healthy weight. This can help take pressure off your knee joint. By Mayo Clinic Staff Request an appointment Diagnosis & treatment March 23, 2022 Print Show references Canoso JJ. Knee bursitis. http://www.uptodate.com/home. Accessed Dec. 19, 2016. Bursitis. Arthritis Foundation. http://www.arthritis.org/about-arthritis/types/bursitis/. Accessed Dec. 19, 2016. Bursitis and tendinitis. National Institute of Arthritis and Musculoskeletal and Skin Diseases. https://www.niams.nih.gov/health_info/bursitis/. Accessed Dec. 19, 2016. Todd DJ. Bursitis: An overview of clinical manifestations, diagnosis, and management. http://www.uptodate.com/home. Accessed Dec. 19, 2016. Prepatellar (kneecap) bursitis. American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=a00338. Accessed Dec. 19, 2016. Pes anserine (knee tendon) bursitis. American Academy of Orthopaedic Surgeons. http://orthoinfo.aaos.org/topic.cfm?topic=a00335. Accessed Dec. 19, 2016. Related Knee bursae Associated Procedures MRI Ultrasound X-ray Products & Services A Book: Mayo Clinic Book of Home Remedies A Book: Mayo Clinic Guide to Arthritis Products for Mobility and Safety Show more products and services from Mayo Clinic Knee bursitisSymptoms&causesDiagnosis&treatmentDoctors&departments Advertisement Mayo Clinic does not endorse companies or products. 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There is a problem with information submitted for this request. Review/update the information highlighted below and resubmit the form. From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. Click here for an email preview. Email ErrorEmail field is required ErrorInclude a valid email address Learn more about Mayo Clinic’s use of data. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and website usage information with other information we have about you. If you are a Mayo Clinic patient, this could include protected health information. If we combine this information with your protected health information, we will treat all of that information as protected health information and will only use or disclose that information as set forth in our notice of privacy practices. You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. Subscribe! Thank you for subscribing! You'll soon start receiving the latest Mayo Clinic health information you requested in your inbox. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry