Knee swelling after running is often due to excess fluid accumulating in or around the knee joint, a condition called effusion. This can stem from several causes related to the physical stress of running.
Common Causes of Runner's Knee Swelling
Several factors can contribute to post-run knee swelling:
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Overuse Injuries: Running, especially without proper warm-up, conditioning, or rest, can strain the ligaments, tendons, and cartilage around the knee joint. This repetitive stress leads to inflammation and fluid buildup. Examples include runner's knee (patellofemoral pain syndrome) and iliotibial (IT) band syndrome.
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Trauma: A fall or direct blow to the knee during a run can cause immediate swelling due to damage to tissues and bleeding.
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Underlying Conditions: Pre-existing conditions like arthritis (osteoarthritis or rheumatoid arthritis) can worsen with running, leading to increased inflammation and swelling.
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Improper Technique: Poor running form can put extra stress on the knee joint, increasing the likelihood of swelling.
Understanding Knee Effusion
As mentioned in the provided reference, a swollen knee, or knee effusion, is characterized by the accumulation of excess fluid. This fluid is the body's natural response to inflammation and injury. The more inflammation, the more fluid accumulates, leading to increased swelling and possibly pain.
What to Do About Swollen Knees
While this response doesn't offer medical advice, it's crucial to consult a doctor or physical therapist if knee swelling persists or is accompanied by severe pain. They can diagnose the underlying cause and recommend appropriate treatment, which may include rest, ice, compression, elevation (RICE), physical therapy, or medication.
