How does Yin deficiency typically manifest in a patient?

Yin deficiency in Traditional Chinese Medicine (TCM) is characterized by a lack of the cooling, moistening, and nourishing qualities associated with Yin. This deficiency often leads to an excess of Yang energy, which can manifest in a variety of symptoms. One of the hallmark signs of Yin deficiency is a feeling of excessive warmth or heat in the body. Patients may experience sensations of internal heat, night sweats, a dry mouth, or a red tongue, all indicating that the cooling and moisture typically provided by Yin is insufficient.

In contrast, other symptoms like fatigue and low energy, cold extremities, or edema would generally be associated with different imbalances, such as Yang deficiency or Qi stagnation. Therefore, the connection between Yin deficiency and the feeling of excessive warmth makes this the appropriate choice in this context.