What are the primary diagnostic signs for a "Heart Yin Deficiency" pattern?

The primary diagnostic signs for a "Heart Yin Deficiency" pattern include palpitations, insomnia, and a red tongue, making this the correct choice.

In Traditional Chinese Medicine (TCM), Heart Yin is essential for maintaining the proper functioning of both the emotional and physiological aspects of the heart. When there is a deficiency of Yin, it leads to an inability to nourish and cool the heart, which can result in symptoms such as palpitations that indicate an irregular heartbeat, often linked to excess Yang energy. Insomnia is another common symptom due to the heart's inability to anchor the mind when Yin is deficient, leading to unrestful sleep.

The appearance of a red tongue further supports a diagnosis of Heart Yin Deficiency. In TCM, a red tongue typically signifies heat or a lack of moisture, which aligns with a deficiency pattern where there is not enough Yin to support the heart’s needs. These signs together paint a clear picture of the Heart Yin Deficiency pattern, making this choice the most accurate representation of the condition.

In contrast, the other symptoms listed in the other choices suggest different patterns. Cold extremities and fatigue can be associated with Yang deficiency, while chills, fever, and stiff neck point towards an external invasion or