足阳明为胃之经，其支脉环于唇，入络于脾。然脾胃为表里，有风热邪气乘之，而冲发
于唇，与血气相搏，则肿结；外为风冷乘，其结肿不消，则成核。
足太阴为脾之经，其气通于口。足阳明为胃之经，手阳明为大肠之经，此二经脉交并于
口。其腑脏虚，为风邪湿热所乘，气发于脉，与津液相搏，则生疮，恒湿烂有汁，世谓之肥
疮，亦名燕口疮。
唇口面皴者，寒时触冒风冷，冷折腠理，伤其皮肤，故令皴劈。经络之气，诸阳之会，
皆在于面，其脉有环唇夹于口者。若血气实者，虽劲风严寒，不能伤之；虚则腠理于面受邪
，故得风冷而皴劈也。
又，冬时以暖汤洗面及向火，外假热气，动于腠理，而触风冷，亦令病皴。
人有生而唇缺，似兔唇，故谓之兔缺。世云，由妇人妊娠时见兔及食兔肉使然。
口臭，由五脏六腑不调，气上胸膈。然腑脏气臊腐不同，蕴积胸膈之间，而生于热，冲
发于口，故令臭也。
《养生方》云∶空腹不用见臭尸，气入脾，舌上白黄起，口常臭也。
手少阴，心之经也，其气通于舌；足太阴，脾之经也，其气通于口。腑脏虚热，气乘心
脾，津液竭燥，故令口舌干焦也。
诊其右手寸口名曰气口以前脉，沉为阴，手太阴肺之经也。其脉虚者，病苦少气不足以
息，嗌干，无津液故也。又，右手关上脉，浮为阳，足阳明胃之经也。其脉虚者，病苦唇口
干。又，左手关上脉，浮为阳，足少阳胆之经也。其脉实者，病苦腹中满，饮食不下，咽干
足阳明胃经是胃的经脉，其分支环绕嘴唇，进入并联络脾脏。脾胃互为表里，若有风热邪气侵袭，冲发于唇部，与血气相互搏结，就会导致肿胀结块；若外部又受风冷侵袭，使得结肿不能消散，就会形成核状物。
足太阴脾经是脾的经脉，其经气通达于口。足阳明胃经是胃的经脉，手阳明大肠经是大肠的经脉，这三条经脉交汇并于口部。如果脏腑虚弱，被风邪湿热所乘袭，经气发动，与津液相互搏结，就会产生疮疡，常常湿润溃烂且有汁液流出，世人称之为肥疮，也叫做燕口疮。
嘴唇和面部皮肤粗糙皲裂，是因为在寒冷时触犯了风冷之气，寒气使腠理收缩，损伤了皮肤，所以导致皮肤皲裂。经络之气汇聚于面部，这是诸阳经交会的地方，其中有经脉环绕嘴唇夹持口部。如果血气充实，即使是强劲的寒风严寒也不能伤害它；如果血气虚弱，面部的腠理受到邪气侵袭，就会因风冷而导致皮肤皲裂。另外，冬天用热水洗脸或靠近火源取暖，借助外部的热气，使腠理开泄，此时再触犯风冷，也会导致皮肤皲裂的疾病。
有的人生来嘴唇有缺损，形状像兔子的嘴唇，所以称为兔缺（兔唇）。世人说，这是因为妇女在怀孕期间见到兔子或食用兔肉所致。
口臭，是由于五脏六腑功能不调，气机上逆至胸膈部位。然而脏腑之气的臊腐气味各不相同，蕴积在胸膈之间，产生内热，冲发于口，所以导致口臭。《养生方》中说：空腹时不要去看臭尸，否则秽气入脾，舌上会出现白黄色苔垢，口中常会发臭。
手少阴心经是心的经脉，其经气通达于舌；足太阴脾经是脾的经脉，其经气通达于口。如果脏腑虚热，热气乘袭心脾，导致津液枯竭干燥，所以引起口舌干燥焦枯。诊察右手寸口脉，名为气口，属于前脉，脉象沉属阴，对应手太阴肺经。如果脉象虚弱，病人苦于气短不足以呼吸，咽喉干燥，没有津液。另外，诊察右手关上脉，脉象浮属阳，对应足阳明胃经。如果脉象虚弱，病人苦于嘴唇和口腔干燥。还有，诊察左手关上脉，脉象浮属阳，对应足少阳胆经。如果脉象实，病人苦于腹部胀满，饮食难以下咽，咽喉干燥。
The Foot-Yangming Stomach Meridian is the meridian of the Stomach; its branch circles around the lips and enters to connect with the Spleen. The Spleen and Stomach are exterior-interiorly related. If Wind-Heat pathogenic factors invade and surge upon the lips, contending with Blood and Qi, swelling and nodulation occur. If externally attacked by Wind-Cold, causing the nodulation and swelling not to resolve, a nodule forms.
The Foot-Taiyin Spleen Meridian is the meridian of the Spleen, and its Qi connects with the mouth. The Foot-Yangming Stomach Meridian is the meridian of the Stomach, and the Hand-Yangming Large Intestine Meridian is the meridian of the Large Intestine; these two meridians intersect and converge at the mouth. When the Zang-Fu organs are deficient and invaded by Wind, Dampness, and Heat, Qi moves within the vessels and contends with Body Fluids, resulting in sores that are constantly moist, ulcerated, and exudative. This is commonly known as Fei Chuang (Plump Sores), also called Yankou Chuang (Swallow's Mouth Sores).
Rough and fissured skin on the lips and face occurs when Wind-Cold is encountered during cold weather. Cold contracts the Couli (pores/skin texture) and damages the skin, leading to cracking. The Qi of the meridians converges in the face, which is the meeting point of all Yang meridians, including those circling the lips and flanking the mouth. If Blood and Qi are substantial, even strong winds and severe cold cannot harm it; if deficient, the Couli in the face are susceptible to pathogens, allowing Wind-Cold to cause cracking. Additionally, washing the face with warm water or warming oneself by fire in winter opens the Couli through external heat; if Wind-Cold is then encountered, it causes this condition.
Some people are born with a cleft lip, resembling a rabbit's lip, hence termed Tu Que (Rabbit Cleft). It is said in popular belief that this results from a pregnant woman seeing a rabbit or eating rabbit meat.
Bad breath arises from disharmony among the Five Zang and Six Fu organs, causing Qi to ascend to the chest and diaphragm. Since the odors of different Zang-Fu organs vary, their accumulation between the chest and diaphragm generates Heat, which surges to the mouth, causing bad breath. The *Yangsheng Fang* states: "Do not view foul corpses on an empty stomach; if the odor enters the Spleen, white-yellow coating appears on the tongue, and the mouth becomes perpetually foul."
The Hand-Shaoyin Heart Meridian is the meridian of the Heart, and its Qi connects with the tongue; the Foot-Taiyin Spleen Meridian is the meridian of the Spleen, and its Qi connects with the mouth. When Zang-Fu deficiency-Heat invades the Heart and Spleen, depleting and drying up Body Fluids, it causes dryness and scorching of the mouth and tongue. Palpating the Cun Kou pulse at the right hand, named Qi Kou, located anteriorly: a deep pulse indicates Yin and corresponds to the Hand-Taiyin Lung Meridian. A deficient pulse here indicates suffering from shortness of breath and insufficient respiration, dry throat, and lack of Body Fluids. Furthermore, palpating the Guan position of the right hand: a floating pulse indicates Yang and corresponds to the Foot-Yangming Stomach Meridian. A deficient pulse here indicates suffering from dry lips and mouth. Additionally, palpating the Guan position of the left hand: a floating pulse indicates Yang and corresponds to the Foot-Shaoyang Gallbladder Meridian. An excess pulse here indicates suffering from abdominal fullness, inability to ingest food, and dry throat.