The difference between heart yin deficiency and heart yang deficiency lies in the symptoms as well as the manifestations of the tongue and pulse. 1. Heart yin deficiency: the main manifestations are palpitations (rapid heartbeat, often accompanied by panic), insomnia, irritability, hot flashes (bursts of fever), night sweating (abnormal sweating after going to sleep, but sweating stops after waking up), sores on the mouth and tongue, dark red color of the face, red tongue, and fine pulse (the pulse becomes narrower and finer, and its rate is faster), etc. The treatment is based on the principle of nourishing heart yin. Treatment is based on the principle of nourishing heart yin, and the formula can be Heavenly King’s Heart Tonic Dan. 2. Deficiency of heart yang: common clinical symptoms include shortness of breath with palpitation, tightness or pain in the heart and chest, aggravated by activity, coldness (fear of cold, cold extremities), mental lethargy, weakness of the limbs, lack of breath and laziness, spontaneous sweating (involuntary sweating during the daytime, aggravated by sweating with a little movement), pallor, pale tongue, white moss, and a weak pulse, etc. The principle of treatment is to nourish the heart’s yang, and the formula may be Baoyuan Tang. If there is a deficiency of heart yin or heart yang, you should consult your clinician and follow the doctor’s instructions. Remember not to use drugs blindly.