“微雨众卉新，一雷惊蛰始”，惊蛰作为春季的第三个节气，是阳气升发、蛰虫惊醒的关键节点。此时春雷乍动，万物复苏，自然界的阳气如破土新芽般蓬勃向上，人体的肝气也随之旺盛。《素问·四气调神大论》言“春三月，此谓发陈，天地俱生，万物以荣”，肝气疏泄有度则气血调和，若升发太过则易致肝风内动、肝阳上亢，引发头晕头痛、烦躁易怒、目赤肿痛等症。而在惊蛰的时令风物中，春蚕及其衍生的白僵蚕、蚕沙、蚕蜕正是清肝息风的良药，从养蚕取丝到入药疗疾，尽显中医“天人相应”的养生智慧。
惊蛰养蚕，是流传千年的农事传统，恰应“蛰虫惊而出走”的物候特点。此时气温回升，桑树抽芽，蚕卵在暖意中孵化成蚁蚕，啃食桑叶，吐丝结茧，正如农谚所云“惊蛰蛾子动，春蚕卵要醒”。唐代诗人李商隐笔下“春蚕到死丝方尽”，道尽了春蚕吐丝的执着与奉献，却鲜少有人知晓，春蚕不仅能织就锦绣绸缎，其衍生的白僵蚕、蚕沙，皆是中医清肝息风的常用药材。
白僵蚕是春蚕幼虫感染白僵菌后致死的干燥体，其性咸、辛，平，归肝、肺经，核心功效便是祛风解痉、化痰散结，尤为适宜春季肝风内动之证。肝主风，春季肝气偏旺，易生内风，或挟痰上扰清窍，引发头痛眩晕、咽喉肿痛，小儿惊风、夜啼不安也多与此相关。《本草纲目》记载白僵蚕“散风痰结核，瘰疬，头风，风虫齿痛”，临床中常与天麻、钩藤配伍，清肝息风、平肝潜阳，缓解肝阳上亢所致的头晕目眩；与桑叶、菊花同用，则能疏风清热，改善目赤肿痛，正合春季养肝明目的需求。
蚕沙，即春蚕的干燥粪便，虽看似寻常，却是一味祛湿平肝的良药。其性甘、辛，温，归肝、脾、胃经，能祛风除湿、和胃化浊。惊蛰时节雨水渐增，湿气与肝气交织，易致脾胃运化失常、肢体困重，而肝主筋，湿邪阻滞经络则会引发关节酸痛。蚕沙既能祛风湿、舒经络，又能和胃健脾，将其炒制后装袋热敷关节，可缓解风湿痹痛；煮水泡脚则能祛湿平肝，改善春季湿气下注导致的足部沉重，兼顾调理肝脾，契合惊蛰“祛湿养肝”的养生原则。
而蚕蜕，即春蚕幼虫在生长过程中蜕下的皮壳，更是惊蛰时节清肝明目的小众良药。其性甘平，归肝、心经，《本草纲目拾遗》记载其“祛风解毒，退翳明目”，恰能应对春季肝阳上亢引发的目赤肿痛、视物昏花。肝开窍于目，春季风邪易扰肝经，上熏目窍，用蚕蜕配伍桑叶、决明子煎水代茶饮，可疏散肝经风热、清肝明目；对于小儿肝热所致的夜啼、眼眵增多，以蚕蜕煮水外洗眼部，再搭配少量蝉蜕内服，能起到轻清疏解之效，温和不伤稚阴。
中药白僵蚕、蚕沙、蚕蜕
惊蛰养生，重在顺时调肝。从春蚕吐丝到僵蚕入药，从蚕沙祛湿到蚕蜕明目，皆是顺应春季阳气升发的自然之法。这几味寻常药材，精准契合春季肝风内动、肝阳上亢的病机，既是中医“药食同源”的生动体现，也藏着古人“借天时养人身”的养生智慧。春日里巧用这些时令药材，清肝护阳，方能安度春三月，尽享万物生长的蓬勃生机。
Nourish Yang and Calm Liver Wind in Awakening of Insects, Safeguard Spring Health with Silkworm and Its Medicinal Derivatives
As the line goes, "Light rain revives all plants; the first thunder heralds the Awakening of Insects." The Awakening of Insects, the third solar term of spring, is a pivotal moment when yang energy surges and hibernating creatures stir. At this time, spring thunder rumbles, all things revive, and the natural yang energy rises vigorously like sprouting shoots breaking through the soil; correspondingly, the liver qi in the human body flourishes as well. Plain Questions·On the Regulation of Spirit in Accordance with the Four Seasons states: "The three months of spring are called the period of sprouting and developing. Heaven and earth are full of vitality, and all things thrive." Unobstructed and moderate dispersion of liver qi ensures the harmony of qi and blood; yet excessive ascension of liver qi may lead to internal stirring of liver wind and hyperactivity of liver yang, triggering symptoms such as dizziness, headache, irritability, irascibility, and bloodshot, swollen eyes. Among the seasonal things of the Awakening of Insects, the spring silkworm and its derivatives—white stiff silkworm, silkworm excrement, and silkworm slough—are excellent medicinal herbs for clearing the liver and calming wind. From raising silkworms for silk to using them as medicine for healing, they fully embody the health preservation wisdom of traditional Chinese medicine (TCM) that "human beings are in harmony with nature".
Raising silkworms in the Awakening of Insects is a millennia-old agricultural tradition, perfectly aligning with the phenological feature of "hibernating insects stirring and scurrying out". Temperatures rise at this time, mulberry trees sprout new leaves, and silkworm eggs hatch into silkworm larvae in the warm air, which feed on mulberry leaves and spin cocoons. As a farming proverb goes: "Moths flutter on the Awakening of Insects; silkworm eggs are ready to hatch." Li Shangyin, a poet of the Tang Dynasty, wrote "A spring silkworm till death spins silk from love-sick heart", depicting the perseverance and dedication of spring silkworms in spinning silk. Yet few know that spring silkworms not only weave magnificent brocades and satins, but their derivatives—white stiff silkworm and silkworm excrement—are also commonly used TCM herbs for clearing the liver and calming wind.
White stiff silkworm is the dried body of spring silkworm larvae that die from infection with Beauveria bassiana. It is salty and pungent in flavor, neutral in nature, and enters the liver and lung meridians. Its core efficacy is to dispel wind and relieve spasm, resolve phlegm and dissipate binds, making it particularly suitable for syndromes caused by internal stirring of liver wind in spring. The liver governs wind; in spring, liver qi tends to be hyperactive, easily generating internal wind, which may ascend to disturb the clear orifices with phlegm, causing headache, dizziness, sore throat and swollen tonsils. Infantile convulsions and night crying are also mostly associated with this condition. Compendium of Materia Medica records that white stiff silkworm can "dispel wind-phlegm, scrofula, headache due to wind, and toothache caused by wind parasites". Clinically, it is often combined with gastrodia elata and uncaria to clear the liver, calm wind, suppress liver yang and alleviate dizziness and vertigo caused by hyperactivity of liver yang; when used with mulberry leaves and chrysanthemums, it can dispel wind-heat and improve bloodshot, swollen eyes, perfectly meeting the demand of nourishing the liver and improving eyesight in spring.
Silkworm excrement, the dried feces of spring silkworms, though seemingly ordinary, is a good medicinal herb for dispelling dampness and calming the liver. It is sweet and pungent in flavor, warm in nature, and enters the liver, spleen and stomach meridians, capable of dispelling wind-dampness, harmonizing the stomach and resolving turbidity. Rainfall increases in the Awakening of Insects, and dampness interweaves with liver qi, easily leading to dysfunction of the spleen and stomach in transportation and transformation, and a heavy feeling in the limbs. Since the liver governs the tendons, stagnation of dampness in the meridians may cause joint soreness and pain. Silkworm excrement can both dispel wind-dampness and relax the meridians, as well as harmonize the stomach and invigorate the spleen. Stir-frying it and packing it into a bag for hot compress on joints can relieve wind-damp bi pain; boiling it in water for foot soaking can dispel dampness and calm the liver, improving the heavy feeling in the feet caused by downward flow of dampness in spring. It takes into account the regulation of the liver and spleen, conforming to the health preservation principle of "dispelling dampness and nourishing the liver" in the Awakening of Insects.
Silkworm slough, the skin shell shed by spring silkworm larvae during their growth, is an underrated medicinal herb for clearing the liver and improving eyesight in the Awakening of Insects. It is sweet in flavor, neutral in nature, and enters the liver and heart meridians. Supplement to the Compendium of Materia Medica records that it can "dispel wind and detoxify, eliminate nebula and improve eyesight", which is exactly suitable for relieving bloodshot, swollen eyes and blurred vision caused by hyperactivity of liver yang in spring. The liver opens into the eyes; wind pathogens in spring tend to invade the liver meridian and fumigate the eye orifices upward. Decocting silkworm slough with mulberry leaves and cassia seeds to replace tea can dispel wind-heat in the liver meridian, clear the liver and improve eyesight. For infantile night crying and increased eye discharge caused by liver heat, boiling silkworm slough in water for external washing of the eyes, combined with a small amount of cicada slough for oral administration, can exert a mild and dispersing effect, relieving symptoms gently without damaging the delicate yin of infants.
Health preservation in the Awakening of Insects focuses on regulating the liver in accordance with the season. From spring silkworms spinning silk to stiff silkworms being used as medicine, from silkworm excrement dispelling dampness to silkworm slough improving eyesight, all are natural methods that conform to the ascension of yang energy in spring. These ordinary medicinal herbs precisely target the pathogenesis of internal stirring of liver wind and hyperactivity of liver yang in spring. They are not only a vivid embodiment of the TCM concept of "homology of medicine and food", but also contain the ancient health preservation wisdom of "nourishing the human body by virtue of the timing of nature". Skillfully using these seasonal medicinal herbs in spring to clear the liver and protect yang energy allows people to get through the three months of spring safely and enjoy the vigorous vitality of all things growing.
