体象 伏为隐伏，更下于沉；推筋着骨，始得其形。
伏之为义，隐伏而不见之谓也。浮中二候，绝无影响；虽至沉候，亦不可见；必推筋至骨，方始得见耳。
主病 伏脉为阴，受病入深。左寸伏者，血郁之愆。伏在左关，肝血在腹。左尺得伏，疝瘕可验。
右寸伏者，气郁之殃。伏在右关，寒凝水谷。右尺得伏，少火消亡。
其主病多在沉阴之分，隐深之地，非轻浅之剂所能破其 垣也。诸证莫非气血结滞，惟右关、右尺责
其无火。盖火性炎上，推筋至骨而形始见，积衰可知。更须以有力无力细为分辨，则伏中之虚实燎然矣。
按《伤寒论》中以一手脉伏为单伏，两手脉伏曰双伏，不可以阳证见阴脉为例也。火邪内郁，不得发
越，乃阳极似阴。故脉伏者，必有大汗而解，正如久旱将雨，必先六合阴晦一回，雨后庶物咸苏也。又有
阴证伤寒，先有伏阴在内，而外复感冒寒邪，阴气壮盛，阳气衰微，四肢厥逆，六脉沉伏，须投姜、附及灸
关元，阳乃复回，脉乃复出也。若太 、冲阳皆无脉者，则必死无疑。刘玄宾云∶“伏脉不可发汗。”为其非
表脉也，亦为其将自有汗也。乃伪诀云∶“徐徐发汗。”而洁古欲以附子细辛麻黄汤发之，皆非伏脉所
宜也。伪诀论形象则妄曰“寻之似有，定息全无”，是于中候见形矣，于伏之名义何居乎？
[Characteristics of Pulse Image]
The Fu (Hidden) pulse manifests as concealed and lies deeper than the Chen (Deep) pulse; it can only be perceived by pushing the fingers down to the bone.
The meaning of the Fu pulse refers to its concealment and invisibility. At both the Floating (Fu) and Middle (Zhong) levels, there is absolutely no trace; even at the Deep (Chen) level, it cannot be seen; one must push the fingers until they reach the bone to perceive its form.
[Analysis of Predominant Diseases]
The Fu pulse belongs to Yin, indicating that the pathogenic factor has penetrated deeply into the interior. A Fu pulse at the Left Cun (Inch) position indicates a deficiency or disorder caused by Blood stasis. A Fu pulse at the Left Guan (Carpal) position suggests Liver Blood accumulation in the abdomen. A Fu pulse at the Left Chi (Cubit) position confirms symptoms of Hernia (Shan Jia).
A Fu pulse at the Right Cun position is a calamity caused by Qi stagnation. A Fu pulse at the Right Guan position indicates Cold coagulation leading to impaired digestion of water and grain. A Fu pulse at the Right Chi position signifies the extinction of the Ministerial Fire (Ming Huo).
The diseases associated with this pulse are mostly located in deep, Yin regions, hidden in profound places; light and mild remedies cannot break through their defenses. All such syndromes involve Qi and Blood stagnation and obstruction, except for the Fu pulses at the Right Guan and Right Chi positions, which are attributed to a lack of Fire (Yang Qi). Since the nature of Fire is to flare upwards, if the pulse is only palpable after pushing to the bone, it indicates severe depletion of vital energy. One must carefully distinguish between forceful and feeble pulses to clearly differentiate between Deficiency (Xu) and Excess (Shi) within the Fu pulse category.
According to the *Shanghan Lun* (Treatise on Cold Damage), a Fu pulse in one hand is called Single Fu, while a Fu pulse in both hands is called Double Fu; this should not be taken as an example of Yin pulses appearing in Yang syndromes. This occurs because Fire pathogen is internally constrained and unable to vent outward, representing a condition where Extreme Yang resembles Yin. Therefore, patients with a Fu pulse will necessarily resolve through profuse sweating, just as before rain follows a long drought, the sky must first become gloomy and dark, after which all things revive. There are also cases of Yin-type Cold Damage, where latent Yin exists internally and is compounded by external contraction of Cold pathogen. With vigorous Yin Qi and depleted Yang Qi, resulting in cold extremities and reversal, the six pulses become deep and hidden. Treatment requires administering Ginger (Gan Jiang) and Aconite (Fu Zi), along with moxibustion at the Guanyuan acupoint, so that Yang Qi may return and the pulse re-emerge. If the pulses at the Taixi and Chongyang acupoints are absent, death is inevitable. Liu Xuanbin stated: "The Fu pulse should not be treated with diaphoresis." This is because it is not a Exterior pulse, but also because spontaneous sweating will occur naturally. However, the spurious *Mai Jue* (Pulse Classic) states: "Gradually induce sweating." Jiegu (Zhang Yuansu) wished to use Fuzi Xixin Mahuang Decoction to induce sweating; neither approach is suitable for the Fu pulse. The spurious *Mai Jue* absurdly describes the image as "seeming present upon searching, completely absent when counting breaths," which describes a pulse visible at the Middle level, contradicting the very definition of the Fu pulse.