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For those suffering from various types of Lin syndrome (a group of diseases characterized by frequent, short, and scanty urination with stinging pain, incomplete emptying, urgency in the lower abdomen, or pain radiating to the lumbar region) and difficult urination, it is due to the obstruction of Qi in the Five Zang organs, dysfunction of the Six Fu organs, stagnation and astringency of the Sanjiao (Triple Burner, referring to the functions of the upper, middle, and lower body regions and their associated organs), and depletion of Ying (Nutritive) and Wei (Defensive) Qi. This is often caused by drinking alcohol while exposed to heat, engaging in sexual intercourse after excessive drunkenness, exhausting the Shen (Spirit), and injuring Blood and Qi through overwork. It may also result from sexual arousal leading to the retention of seminal fluid, indulgence in concubines causing excessive loss of essence, sudden fright and instability, chronic worry and anxiety, irregular meals, strenuous travel, forcibly holding urine or feces, cold invading the Bladder, prolonged sexual activity without ejaculation, or summerheat injuring the bladder sac. Negligence in these aspects leads to this disease. Due to variations in symptoms, the names differ, including Cold Lin, Heat Lin, Qi Lin, Labor Lin, Gao Lin (Glandular Lin), Sha Lin (Gravel Lin), Deficiency Lin, and Excess Lin.

Cold Lin presents with frequent urination and white turbid urine resembling rice wash water. Heat Lin presents with obstructed urination and red urine resembling blood. Qi Lin presents with fullness and oppression in the umbilical and abdominal regions, with difficult and painful urination. Labor Lin presents with continuous dribbling of urine, like a leaking drip that does not stop. Gao Lin presents with the discharge of substance resembling grease or paste in the urine. Sha Lin presents with dull pain in the umbilical and abdominal regions, difficulty in urination, and unbearable pain at any moment; gravel stones are passed in the urine, some as large as gleditsia seeds, varying in color between red or white. This occurs because Kidney Qi is strong but suppressed due to lust for women, leading to closure without emission, or emission without cessation, which injures true Qi. As pathogenic heat gradually weakens, it condenses into gravel. This is similar to salt turning into stone when boiling with high fire and little water. Among the eight types of Lin, Sha Lin is the most critical. If the pulse is large and excess, it is treatable; if the pulse is deficient, small, and damp, it is untreatable. Deficiency type indicates both Kidney and Bladder deficiency, manifesting as seminal slipperiness, nocturnal emission, and urinary incontinence. Excess type indicates blockage of meridians and collaterals, with impaired water pathways, penile pain, and leg soreness. Generally, if the symptoms of Lin correspond with the pulse, survival is likely; if they contradict, death or misfortune is predicted. Treatment requires careful deliberation.

The administration of medicines in ancient and modern times has had both successes and failures, largely depending on appropriateness. Whether using herbs, trees, metals, or minerals; whether single prescriptions prove effective or compound formulas achieve success; whether mineral drugs cause death due to toxicity or promote longevity—the varied outcomes raise the question: why? If the patient's fundamental Qi is solid and receives herbs with dispersing and unblocking properties, recovery will surely occur. However, young, wealthy, and vigorous individuals who rely on their learning and physical strength, indulge in wine and desires, boast of their techniques, and secretly damage their internal Spirit, relying on medicinal support, may suddenly fall ill. How can such cases be cured? Such situations not only involve internal disasters but also the futility of medication, which is truly lamentable. If one can thoroughly understand medical texts, carefully assess appropriateness, and ensure harmony between the person and the medicine, how could efficacy be false? For example, if Zang organs are deficient, nourish them; if Fu organs have excess, drain them; if exterior excess exists, treat the exterior; if interior deficiency exists, nourish the interior; if upper obstruction exists, guide upwards; if lower obstruction exists, unblock downwards; if middle stagnation exists, resolve the middle; if left side is open, treat the left; if right side is diseased, treat the right. By applying methods appropriate to the upper, lower, left, right, interior, exterior, deficiency, and excess, how could premature death occur?