肾主腰脚，其经虚，风冷客之，则腰痛；冷气乘虚入腹，则腹痛。故令腰腹相引而痛不
止，多动胎。腰痛甚者，则胎堕也。
妊娠小腹痛者，由胞络宿有冷，而妊娠血不通，冷血相搏，故痛也。痛甚亦令动胎也。
此谓卒有损动，或冷热不调和，致伤于胎，故卒痛。下血不止者，堕胎也。
吐血，皆由腑脏伤所为。忧思惊怒，皆伤脏腑，气逆，故吐血。吐血而心闷胸满，未欲
止，心闷甚者死。妊娠病之，多堕胎也。
尿血，由劳伤经络而有热，热乘于血，血得热流溢，渗入于胞，故尿血也。
阳施阴化，故得有胎，荣卫和调，则经养周足，故胎得安，而能成长。若血气虚损者，
子脏为风冷所居，则血气不足，故不能养胎，所以致胎数堕。候其妊娠而恒腰痛者，喜堕胎
冬时严寒，人体虚而为寒所伤，即成病为伤寒也。轻者啬啬恶寒，吸吸发热，
微咳鼻塞，数日乃止；重者头痛体疼，憎寒壮热。久不歇，亦伤胎也。
冬时严寒，人体虚，触冒之得病，名伤寒。其状∶头痛、体疼、壮热。瘥后体虚，尚未
平复，或起早，或饮冷过度，病更如初，故谓之复也。
四时之间，忽有非切之气，如春时应暖而反寒，夏时应热而反冷，秋时应凉而反热，冬
时应寒而反温，非其节而有其气。一气之至，无人不伤，长少虽殊，病皆相似者，多挟于毒
。言此时普行此气，故云时气也。妊娠遇之，重者伤胎也。
The Kidney governs the waist and lower limbs. If its meridians are deficient, wind-cold pathogenic factors may invade, causing lower back pain; if cold qi enters the abdomen by taking advantage of this deficiency, abdominal pain occurs. Thus, the waist and abdomen pull each other in pain without cessation, which easily disturbs the fetus. Severe lower back pain may lead to miscarriage.
Abdominal pain during pregnancy is caused by pre-existing cold in the Bao Luo (uterine collaterals). During pregnancy, blood circulation becomes obstructed, and cold blood clashes with normal blood, resulting in pain. Severe pain also disturbs the fetus.
This refers to sudden injury or disturbance, or imbalance between cold and heat, damaging the fetal Qi, hence sudden pain. If bleeding from the vagina continues incessantly, it indicates miscarriage.
Hematemesis (vomiting blood) is caused by damage to the Zang-Fu organs. Worry, overthinking, fright, and anger all injure the Zang-Fu organs, causing Qi rebellion, thus leading to hematemesis. Hematemesis accompanied by chest oppression and fullness that does not cease, especially when severe chest oppression occurs, can be fatal. Pregnant women suffering from this condition often experience miscarriage.
Hematuria (blood in urine) results from labor injuring the meridians and generating heat. Heat invades the blood; when blood is heated, it flows excessively and seeps into the Bladder, causing hematuria.
Yang provides the active force, and Yin provides the transformative substance, allowing conception to occur. When Ying and Wei (Nutritive and Defensive Qi) are harmonious, menstrual nourishment is sufficient, ensuring the fetus remains stable and grows normally. If Qi and Blood are deficient, the Zi Zang (uterus) becomes occupied by wind-cold, leading to insufficient Qi and Blood to nourish the fetus, thereby causing recurrent miscarriages. Those who constantly suffer from lower back pain during pregnancy are prone to miscarriage.
In winter, extreme cold damages the body when it is deficient, resulting in Shang Han (Cold Damage disease). Mild cases present with aversion to cold, fever, slight cough, and nasal congestion, resolving after several days; severe cases involve headache, body aches, aversion to cold, and high fever. If prolonged, it also harms the fetus.
In winter, extreme cold damages the body when it is deficient upon exposure, named Shang Han (Cold Damage disease). Its manifestations include headache, body pain, and high fever. After recovery, if the body remains weak and has not fully recuperated, early rising or excessive consumption of cold drinks can cause the illness to recur as before, hence termed "Fu" (Relapse).
During the four seasons, sudden abnormal climatic conditions may occur: spring should be warm but turns cold; summer should be hot but turns cool; autumn should be cool but turns hot; winter should be cold but turns warm. These are climates inappropriate for the season. When such a climate arrives, no one escapes harm. Although severity varies by age, symptoms are similar, often involving toxic pathogens. Since this climate prevails universally at that time, it is called Shi Qi (Seasonal Epidemic Qi). Pregnant women exposed to it may suffer fetal harm, especially in severe cases.