Taiyang disease, fever, with a deep and thin pulse, is called convulsive disease, which is difficult to treat.

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Fever is a symptom of Taiyang disease. A deep and thin pulse is a sign of Shaoyin pulse. It is called convulsive disease because there must be either rigid or soft symptoms present. It is a condition where the Taiyang convulsive disease manifests with a Shaoyin pulse, indicating a combined exterior and interior disease. The pathogenic factors of Taiyang are stagnated externally, hence the fever; the pathogenic factors of Shaoyin are congealed internally, hence the deep and thin pulse. However, if convulsive disease presents with a wiry and tight pulse, it is the original pulse, and even if it is deep and slow, it is still treatable. Now, with a deep and thin pulse, the pathogenic factors have entered Shaoyin, and the Yang Qi has already declined. Is it easy to treat? Hence, it is said to be difficult.