The small intestine and the heart are connected through the meridians as each other, and both of them transmit each other pathologically, the heart can transfer heat to the small intestine; the real heat of the small intestine can be smoked up to the heart. The heart can move heat in the small intestine: the hand shaoyin heart meridian and the hand sun small intestine meridian mutual complex belonging to the heart, so the heart fire can be moved down to the small intestine, affecting the small intestine to separate the function of the turbid and the clear, causing urination short and red (urine volume is small, dark yellow color), burning pain in the urethra, urinary blood, etc., can be used to clear the heart of the diuretic method of conduction of the downward movement of the heat. Small intestine heat in the heart: small intestine heat, can also be up through the heart, heartburn, tongue red, mouth and tongue sores and erosion and other inflammation of the heart fire pathology, in the treatment, you can clear the heart and diarrhea and clear the urine and the use of drugs. The symptoms related to the heart and small intestine need to go to the hospital in a timely manner, individuals should not diagnose or treat on their own, so as not to cause adverse consequences and delay the condition.