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To treat diseases of spring-warmth and summer-heat, the symptoms include fever and headache, which are similar to typical Shanghan (Cold Damage), but without aversion to cold and with thirst.

Chaihu (1 qian 2 fen) [Bupleuri Radix], Gegen (1 qian 5 fen) [Puerariae Radix], Chishao (1 qian) [Paeoniae Radix Rubra], Gancao (5 fen) [Glycyrrhizae Radix et Rhizoma], Huangqin (1 qian 5 fen) [Scutellariae Radix], Zhimu (1 qian) [Anemarrhenae Rhizoma], Beimu (1 qian) [Fritillariae Bulbus], Shengdi (2 qian) [Rehmanniae Radix], Danpi (1 qian 5 fen) [Moutan Cortex].
Decoct in water and take orally.
If there is vexation, add ten slices of Danzhuye (Lophatheri Herba); if there is delirium, add 3 qian of Shigao (Gypsum Fibrosum).

Question: Why is headache considered a Taiyang disease (disease pattern caused by pathogenic factors invading the Taiyang channel)? Answer: The three Yang channels all ascend to the head and can cause headache. However, the Taiyang channel is the longest, so headaches are mostly due to Taiyang involvement; thus, headache is regarded as a exterior syndrome. Another question: Is there a distinction in headache among the three Yang channels? Answer: The Taiyang channel starts from the vertex, enters the brain, emerges again, descends separately behind the neck, follows the shoulder blades, and reaches the middle of the waist from the paravertebral region. Therefore, Taiyang headache involves pain in the head that radiates to the nape and spine. The Yangming channel originates at the side of the nose, connects with the eyes, and meets at the forehead. Consequently, Yangming headache involves pain in the forehead that radiates to the face and eyes. The Shaoyang channel originates at the outer canthus and descends behind the ear. Thus, Shaoyang headache involves pain around the ears that extends upward to the temporal angle. These features serve as distinctions. Another question: The three Yin channels normally do not present with headache. Now, in cases of direct invasion (pathogen directly entering the zang-fu organs), headache also occurs. Why is this? Answer: This is due to direct invasion accompanied by external contraction. Another question: When Shanghan transmits to the Jueyin channel, headache also occurs. Why? Answer: In Jueyin syndrome, headache with a floating pulse indicates interior pathogens reaching the exterior, seeking resolution through sweating; therefore, a mild diaphoretic method should be used. Another question: In Yangming fu-organ disease, with thirst and constipation, headache also occurs. Why? Answer: The Yangming channels connect with the head and eyes. Due to the steaming effect of heat in the fu-organs, it attacks upward to the head and eyes, causing headache. Exterior channel diseases can transmit to the fu-organs, and fu-organ diseases can also affect the channels; this is the fundamental principle of their interconnection. However, only when there are definite fu-organ signs should Baihu Tang (White Tiger Decoction) be used to clear the heat. If these symptoms occur during the initial stage of aversion to cold and fever, it is an external contraction of wind-cold and should not be confused with Yangming fu-organ disease.