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Learn about your mild knee swelling, including causes and common questions. Or get a personalized analysis of your mild knee swelling from our A.I. health assistant. At Buoy, we build tools that help you know what’s wrong right now and how to get the right care.

Mild Knee Swelling Checker

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Your Mild Knee Swelling May Also be Known as:
Knee a little puffy
Knee a little swollen
Knee mildly puffy
Knee mildly swollen
Knee slightly puffy
Knee slightly swollen
Mild knee puffiness
Slight knee puffiness
Slight knee swelling

Top 10 Mild Knee Swelling Causes

  1. 1.Meniscal Injury

    A torn meniscus is one of the most common knee injuries. Any activity that causes forceful twisting of the knee, especially when putting the pressure of one's full weight on it, can lead to a torn meniscus.

    Conservative treatment such as rest, ice and medication is sometimes enough to relieve the pain of a torn meniscus and give the injury time to heal on its own. In other cases, however, a torn meniscus requires surgical repair, which can be best determined by your doctor or physiotherapist.

    Rarity:
    Common
    Top Symptoms:
    pain in one knee, knee stiffness, pain in the inside of the knee, knee instability, knee pain from an injury
    Urgency:
    Primary care doctor
  2. 2.Infrapatellar Bursitis

    Bursae are small fluid-filled sacks located around the body in strategic locations to provide a cushion and help reduce friction. There is a pair of bursae below each kneecap (patella). Infrapatellar bursitis is a condition where these bursae are inflamed. It is a common cause of knee pain in people whose work involves frequent kneeling on hard surfaces.

    You can safely treat this condition on your own. Rest and elevation (raising the knee up when sitting or laying down) are effective home remedies. You might also consider avoiding kneeling postures, as well as take over-the-counter medications such as ibuprofen (Advil) or acetominophen (Tylenol) to help with any pain symptoms.

    Rarity:
    Uncommon
    Top Symptoms:
    pain in one knee, spontaneous knee pain, knee pain that gets worse when going up stairs, dull, achy knee pain, knee pain that gets worse when squatting
    Urgency:
    Self-treatment
  3. 3.Septic Arthritis

    Septic arthritis is an intensely painful joint infection.

    You should go to the ER immediately. Treatment entails draining the infected area and providing antibiotics to fight the infection.

    Rarity:
    Rare
    Top Symptoms:
    fever, chills, joint pain, knee pain, pain in one knee
    Urgency:
    Hospital emergency room
  4. 4.Osteochondritis Dissecans

    At joints where bones meet, bones are covered with a layer of cartilage which provides shock absorbance and lubrication. Osteochondritis dissecans is a condition where a piece of cartilage with a thin layer of bone detach from the larger bone, causing pain.

    You should visit your primary care physician. Conservative therapy is first considered, such as resting the joint, and physical therapy. Surgery is performed if the conservative treatment fails.

    Rarity:
    Rare
    Top Symptoms:
    pain in one knee, knee pain that gets worse during a run, knee stiffness, knee instability, spontaneous knee pain
    Urgency:
    Primary care doctor
  5. 5.Benign Bony Growth (Osteochondroma)

    An osteochondroma is a non-cancerous growth that usually develops during childhood or adolescence. It is a benign tumor that forms on the surface of a bone near the growth plate.

    You should visit your primary care physician for X-Ray evaluation. In most cases this condition is treated by careful observation over time to make sure the tumor does not grow. Surgery is considered if the osteochondroma causes pain, puts pressure on a nearby nerve or blood vessel, or has a large cap of cartilage.

    Rarity:
    Rare
    Top Symptoms:
    numbness in one arm, numbness in one thigh, swelling of one arm, hip deformity, swollen knee
    Urgency:
    Primary care doctor

    Mild Knee Swelling Checker

    Take a quiz to find out why you’re having mild knee swelling.

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  6. 6.Synovial Chondromatosis

    Synovial chondromatosis is a disease affecting the synovium, which is a thin flexible membrane around a joint. It can often be confused with tendinitis and/or arthritis.

    You should visit your primary care physician to discuss the possibility of removing the synovium.

    Rarity:
    Rare
    Top Symptoms:
    joint swelling, pain in one knee, swollen knee, swollen ankle, spontaneous knee pain
    Symptoms that always occur with synovial chondromatosis:
    joint swelling
    Symptoms that never occur with synovial chondromatosis:
    fever, night sweats, unintentional weight loss, warm red ankle swelling, warm red knee swelling, warm and red elbow swelling
    Urgency:
    Primary care doctor
  7. 7.Acl Injury

    The ACL (anterior cruciate ligament) is a super-important tendon that connects the femur (thigh bone) to the tibia (shin), keeping the tibia from flying forward every time a step is taken. Tearing happens in a lot of accidents and sports, unfortunately.

    You should seek immediate medical care at an ER. An ACL tear is very painful and requires surgery, and the sooner that happens, the better the outcome.

    Rarity:
    Rare
    Top Symptoms:
    knee pain, pain in one knee, knee instability, knee pain from an injury, swollen knee
    Symptoms that always occur with acl injury:
    knee pain
    Symptoms that never occur with acl injury:
    mild knee pain
    Urgency:
    Hospital emergency room
  8. 8.Patellofemoral Pain Syndrome

    The kneecap (patella) is located directly in front of the thigh bone (femur), and should normally glide freely up and down. In this condition, called patellofemoral pain syndrome, the kneecap may rub against the thigh bone instead of gliding smoothly, causing damage and pain.

    You should visit your primary care physician. While you can safely take steps to treat this condition at home (avoiding strenuous use of the knee and taking over-the-counter pain medication), your doctor may coordinate care with a physical therapist to help manage your pain and function of the knee.

    Rarity:
    Common
    Top Symptoms:
    knee pain, pain in one knee, knee pain that gets worse when going up stairs, dull, achy knee pain, knee pain that gets worse when squatting
    Symptoms that always occur with patellofemoral pain syndrome:
    knee pain
    Urgency:
    Primary care doctor
  9. 9.Skin Infection of the Knee

    Cellulitis is an infection of the skin and tissues underneath it. It is most commonly caused by Group A strep and typically enters the body through a break in the skin.

    You should go to your primary care doctor tomorrow. There, he or she will inspect your skin and determine if antibiotics are necessary.

    Rarity:
    Uncommon
    Top Symptoms:
    fever, knee pain, knee redness, knee injury, painful knee swelling
    Symptoms that always occur with skin infection of the knee:
    knee redness
    Urgency:
    Primary care doctor
  10. 10.Disseminated Gonococcal Infection

    Disseminated gonococcal infection (DGI) is an infection from a sexually transmitted bacteria known as Neisseria gonorrhoeae. It spreads to distant parts of the body beyond the original portal of entry and usually manifest by rash and arthritis.

    You should visit your primary care physician to confirm the diagnosis and discuss treatment options for managing symptoms.

    Rarity:
    Rare
    Top Symptoms:
    fatigue, joint pain, fever, chills, moderate fever
    Urgency:
    Primary care doctor

Questions Your Doctor May Ask About Mild Knee Swelling

  • Q.Is your knee swelling getting better or worse?
  • Q.Is your knee pain getting better or worse?
  • Q.How severe is your knee pain?
  • Q.Is the knee pain affecting one or both knees?

If you've answered yes to one or more of these questions, check our mild knee swelling symptom checker.

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Mild Knee Swelling Symptom Checker Statistics

  • People who have experienced mild knee swelling have also experienced:

    • 33% Knee Pain
    • 13% Swollen Knee
    • 13% Swollen Calf
  • People who have experienced mild knee swelling had symptoms persist for:

    • 30% Over a Month
    • 28% Less Than a Week
    • 18% Less Than a Day
  • People who have experienced mild knee swelling were most often matched with:

    • 38% Meniscal Injury
    • 38% Infrapatellar Bursitis
    • 23% Septic Arthritis

Mild Knee Swelling Checker

Take a quiz to find out why you’re having mild knee swelling.

Take a quiz