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？
【脉象特征】
伏脉表现为隐伏，位置比沉脉更深；必须推按筋骨之间，才能触得其形态。
伏脉的含义，是指脉搏隐伏而不可见。在浮取和中取两个层次，完全找不到脉搏的迹象；即使在沉取时，也看不见脉搏；一定要将手指推至筋骨之间，才能见到脉搏的形态。
【主病分析】
伏脉属于阴脉，表明病邪已深入体内。左寸部出现伏脉，是血气郁滞的过失所致。伏脉出现在左关部，提示肝血积聚于腹部。左尺部出现伏脉，疝气和腹内结块的症状可以得到验证。
右寸部出现伏脉，是气机郁滞造成的祸患。伏脉出现在右关部，提示寒邪凝滞导致水谷不化。右尺部出现伏脉，提示命门之火消亡。
伏脉所主的病症多位于深沉阴暗的部位，隐蔽深藏之处，不是轻浅的药物所能攻破其壁垒的。各种证候无非是气血凝结阻滞，只有右关、右尺部位的伏脉责之于阳气（火）不足。因为火的性质是炎上，若需推筋至骨才能触及脉形，说明正气积衰已甚。还需要仔细分辨脉搏的有力与无力，那么伏脉中的虚证与实证就一目了然了。
查阅《伤寒论》，其中将单手脉伏称为单伏，双手脉伏称为双伏，不能将其作为阳证出现阴脉的例子来理解。这是因为火邪内郁，不得发散，属于阳极似阴的情况。所以脉伏者，必定会通过大汗淋漓而解病，正如久旱将雨之前，天地四方必先变得阴沉晦暗，雨后万物才会复苏一样。又有阴证伤寒，先有伏阴在内，外又感受寒邪，阴气壮盛，阳气衰微，四肢厥冷逆乱，六脉沉伏，需要投用干姜、附子以及灸关元穴，阳气才能回复，脉搏才能复出。如果太溪穴、冲阳穴都摸不到脉搏，那就必然死亡无疑。刘玄宾说：“伏脉不可发汗。”因为这不是表证脉象，也是因为它将会自然出汗。然而伪托的《脉诀》却说：“徐徐发汗。”洁古（张元素）想用附子细辛麻黄汤来发汗，这些都不适合伏脉。伪《脉诀》论述脉象形象时荒谬地说“寻之似有，定息全无”，这是在沉取的中层部位见到脉形了，这与伏脉的名义怎么相符呢？
[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.