Traditional Chinese medicine believes that wind, cold, and dampness combine to form Bi. Bi disease refers to a disease caused by the obstruction of qi and blood, resulting in pain, stiffness, and poor flexion and extension of limb joints. The three Qi of wind, cold, and dampness are the main causes of Bi disease, with wind evil as the precursor, cold evil as the root of the disease, and dampness evil as the helper. The good deeds of wind and evil are constantly changing, cold and evil are prone to stagnation in the tendons and meridians, and dampness and evil are prone to blocking the qi flow. When the three invade the human body at the same time, it can lead to poor circulation of qi and blood, obstruction of meridians, and thus cause bi disease.
The symptoms of bi disease vary from individual to individual, but overall, common symptoms include joint pain, stiffness, swelling, and poor flexion and extension. The onset of Bi disease is related to various factors such as climate, environment, and lifestyle habits. For example, long-term exposure to a cold and humid environment, or maintaining poor posture for a long time, can trigger rheumatism.
中医认为，风寒湿三气杂至，合而为痹。痹病是指由于气血痹阻不通，导致肢体关节疼痛、僵硬、屈伸不利的一种疾病。风寒湿三气是痹病的主要病因，其中风邪为先导，寒邪为病之本，湿邪为病之助。风邪善行数变，寒邪易凝滞筋脉，湿邪易阻遏气机。当三者同时侵袭人体时，会导致气血运行不畅，经络受阻，从而引发痹病。

痹病的症状因个体差异而异，但总体来说，常见的症状包括关节疼痛、僵硬、肿胀、屈伸不利等。痹病的发病与气候、环境、生活习惯等多种因素有关。例如，长期处于阴冷、潮湿的环境中，或长期保持不良姿势，都可能诱发痹病。