The way to treat illness is not just a child's play, and one must act cautiously. If you want to know the depth of the condition, you must first investigate the source of the disease. Just like exploring treasures to find the source, careful thinking is necessary to gain insight into the mysteries of the illness.
The source of the disease is the root of the disease. There must be a cause for any disease, and the cause may be due to cold, heat, dampness, dryness, deficiency, or excess. If cold evil invades, the human body's yang qi is damaged, leading to cold coagulation and stagnation of qi and blood, which is the source of cold diseases.
治病之道，非同儿戏，必须审慎行事。若欲知病情之深浅，必先察其病源所在。如同探宝寻源，需细心思索，方可洞察病情之奥秘。

病源者，疾病之根本也。有疾病必有病因，病因者或因寒、或因热、或因湿、或因燥、或因虚、或因实。如寒邪侵袭，人体阳气受损，导致寒凝气滞，气血不畅，此为寒病之源。