Heat in the heart of the left hand is usually caused by kidney yin deficiency, and the patient may also experience hot flashes (hot sensation spreading from the face or chest to the whole body), night sweating and other symptoms. Kidney yin deficiency is usually caused by loss of kidney essence and blood due to depletion of qi and blood in the patient’s body or prolonged late-night work, or insufficient yin fluid in the body due to prolonged inattention to a proper diet. Typical symptoms of the patient are five heart-heat symptoms, i.e. heat in the palms of the hands and the hearts of the feet, heat in the chest, and irritability. In addition to the above symptoms, patients are usually accompanied by hot flashes (hot sensation spreading from the face or chest to the whole body), night sweats, dizziness, tinnitus, insomnia, redness of the cheekbones, and soreness and weakness of the waist and knees. At the same time, male patients may also experience symptoms such as high libido, premature ejaculation, spermatorrhea, etc. Female patients may experience symptoms such as decreased menstrual flow, amenorrhea, or abnormal vaginal bleeding during non-menstrual periods. Patients with left hand heart heat are advised to seek medical examination first, and choose the appropriate way of treatment under the doctor’s diagnosis and treatment.