Excess Weight Worsens Joint Pain, Doctors Warn

Excess weight is a major, often overlooked, contributor to chronic knee and lower back pain, according to Dr. Yen Yun-shan, a physical medicine and rehabilitation specialist at Jiayun Clinic. Many patients who suffer from persistent pain find that medications and physical therapy offer only temporary relief because the underlying issue of excess weight is not addressed.

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Clinical observation shows that many patients' pain stems not only from joint problems themselves, but from long-ignored weight factors that continuously worsen the damage.

Dr. Yen explains that the knee joint bears over three times the body's weight during walking for every kilogram gained, and even more when going up or down stairs. This constant overload accelerates wear and tear on cartilage and ligaments. For the lower back, accumulated abdominal fat shifts the body's center of gravity forward, forcing back muscles to overcompensate. This increases pressure on the intervertebral discs and facet joints, leading to disc herniation and chronic lower back pain.

Beyond physical pressure, fat tissue releases inflammatory substances called adipokines. These substances inhibit the self-repairing ability of cartilage and make nerves more sensitive to pain. This explains why some overweight individuals experience intense pain even with relatively minor joint damage. Studies show that losing just 7-10% of body weight can significantly reduce pain, offering relief that lasts longer than painkillers. Even a 5% weight reduction improves insulin sensitivity and lowers inflammation markers, benefiting overall health.

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For every kilogram of weight gained, the knee bears more than three times the pressure when walking.

The most challenging situation arises from a vicious cycle: pain leads to reduced movement, which in turn makes weight control more difficult. As patients move less, their muscle strength declines, destabilizing the joints and worsening wear. Dr. Yen advises a phased treatment approach. First, manage acute pain and inflammation. Once the joint condition stabilizes, introduce personalized core muscle training and low-impact exercises like brisk walking, swimming, or cycling to gradually rebuild joint support.

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Fat tissue itself continuously secretes pro-inflammatory substances (adipokines), which inhibit cartilage self-repair and increase nerve sensitivity to pain.

Weight management should focus on adjusting dietary structure and developing regular exercise habits rather than extreme dieting. Prioritize protein, colorful fruits, and vegetables while reducing refined sugars and fried foods. Exercise should begin with low-impact activities that do not exacerbate joint pain. Dr. Yen recommends seeking medical advice if knee or back pain impacts daily activities or sleep to identify structural causes and discuss a weight management plan for lasting treatment effects.

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The most difficult situation clinically is the vicious cycle of 'the more pain, the less willing to move; the less movement, the harder it is to control weight.'