Afraid to bend over due to back pain, heavy legs that make it hard to take a step, feeling exhausted after just a few minutes of walking—many people are troubled by such bone and muscle issues. They often rely on painkillers or plasters for temporary relief, but these only address the symptoms, not the root cause. Once rainy or humid weather arrives, the pain returns. In fact, the root of back and leg problems lies in both "external" and "internal" factors. Today, we'll break this down and share a potent formula that nourishes the liver and kidneys while strengthening the bones and muscles.

First, let's discuss the causes, which are mainly divided into "external factors" and "internal factors." As early as the 《Inner Canon of the Yellow Emperor》, it was recorded: "When wind, cold, and dampness mix together, they combine to form obstruction (痹)." These are the most common external factors. Wind pathogens are changeable, causing pain to shift locations; cold pathogens act like "ice blocks," freezing the flow of qi and blood, leading to blocked meridians and stiff joints; damp pathogens are sticky, heavy, and tend to sink downward, clinging to the waist and legs, causing soreness, numbness, and making the condition recurrent and difficult to resolve.

The internal cause is even more crucial—"the kidneys govern the bones, and the liver governs the tendons." The waist and legs fall within the realm of tendons and bones. Long-term pain inevitably depletes the liver and kidneys, weakening the qi and blood. At this point, the body's defenses become compromised, and wind-cold-dampness pathogens can "take advantage of the weakness" to penetrate deep into the joints and settle in the bone crevices. When rainy or overcast weather arrives, the external cold-dampness combines with the internal pathogens, naturally worsening the pain.

For this situation characterized by "excess pathogens and deficient vital qi," Sun Simiao's "Duhuo Jisheng Tang" is particularly appropriate. Known as the "foremost formula for dispelling wind-dampness," it is now available in pharmacies as the proprietary Chinese medicine "Duhuo Jisheng Wan," making it very convenient to use. This formula consists of 15 medicinal ingredients, simultaneously expelling pathogens and replenishing vital qi, effectively addressing both the root cause and symptoms.

In this formula, *Duhuo* is used in the largest quantity, capable of penetrating deep into the lower burner's tendons and bones to expel hidden wind-cold-dampness pathogens. Medicinals like *Xixin* and *Fangfeng* assist in dispelling pathogens and relieving impediment and pain. More crucially, *Sangjisheng* and *Duzhong*—these "guardians of tendons and bones"—specifically supplement the liver and kidneys, strengthening tendons and bones. Combined with *Renshen* and *Fuling* to replenish qi and blood, and *Danggui* and *Chuanxiong* to invigorate blood and unblock collaterals, this ensures the liver and kidneys are nourished and qi and blood are abundant, naturally empowering the tendons and bones.

If you are constantly troubled by lower back pain and heavy legs, don't just endure it. This formula, which both expels cold-dampness and supplements the liver and kidneys, is worth trying. However, it is important to use it based on pattern differentiation and to take it under the guidance of a professional medical practitioner, allowing your tendons and bones to regain flexibility and strength.