Hello! Heart-yang deficiency is often caused by the further development of heart-qi deficiency, or by other visceral diseases that damage the heart-yang. The main symptoms are: palpitation, shortness of breath, chest tightness, or chest pain, spontaneous sweating, chills and cold limbs, mental fatigue, or cyanosis of the face and lips, pale fat or dark purple tongue, white and slippery fur, weak pulse or knot or generation.

I hope it helps you!