Which of the following is NOT one of the six exogenous factors?

The six exogenous factors in Traditional Chinese Medicine (TCM) refer to external influences that can lead to disease or health conditions. These include Wind, Heat, Cold, Dampness, Dryness, and Fire. Each of these factors has specific characteristics that can disrupt the balance of the body's Qi and contribute to illness.

Wind is often considered the chief among the exogenous factors due to its nature of being a carrier that can usher in other pathogenic influences. Heat can lead to conditions that manifest as redness, fever, or inflammation. Humidity, or Dampness, can cause stagnation and is associated with sensations of heaviness or bloating. Knowing these factors helps practitioners understand the external origins of disease.

Gravity, on the other hand, while it affects physical body conditions and postural health, does not fall within the concept of exogenous factors as understood in TCM. It does not specifically correspond to a pathogenic influence that affects Qi or leads to disease. Hence, gravity is not recognized as one of the six exogenous factors that influence health in the same way that Wind, Heat, and Humidity do.