What symptom differentiates Heart Blood deficiency from other types of deficiency?

The symptom that distinctly differentiates Heart Blood deficiency from other types of deficiency is stiffness or tightness in the chest. This symptom is closely associated with the Heart's role in housing the mind (Shen) and its function in circulation. When the Heart lacks sufficient blood, it can cause a sense of constriction or tension, particularly in the chest area, which is not typically observed with other types of deficiencies, such as Spleen Qi deficiency or Kidney Yin deficiency.

While other options present valid symptoms related to different types of deficiencies, they do not specifically indicate Heart Blood deficiency. Scanty menses typically relates to Blood or Qi deficiency in other organs, a thickly coated tongue could indicate dampness or phlegm rather than a specific blood deficiency, and sparse hair and skin issues point more toward deficiencies in Kidney or Liver rather than the Heart.