What is the characteristic of P-5, an empirical point for treating malaria?

P-5, also known as Pericardium 5, is classified as a Jing River point. Jing River points are located at the junction of the meridian's course and are typically associated with the body's ability to influence more profound physiological changes. In traditional Chinese medicine, these points often play a significant role in regulating the movement of Qi and blood, and they are particularly involved in addressing conditions that may affect the internal organs.

When used as an empirical point for treating malaria, P-5 can help to alleviate the symptoms associated with this condition by enhancing the body's ability to manage heat and toxins, which are relevant in the context of malaria. The Jing River designation indicates its function in supporting the transformation of energy and fluids within the body, aligning well with the therapeutic needs when addressing malarial symptoms.

In conclusion, the classification of P-5 as a Jing River point underscores its significance in acupuncture, particularly in the context of treating conditions like malaria, where regulation of internal processes is crucial.