The rapid heart rate after urination may be due to nerve reflexes leading to rapid heart rate, low blood pressure, low blood sugar and other reasons. 1. Nerve reflexes lead to a faster heart rate: rapid urination after urination, especially after prolonged urinary holding, will lead to a decrease in intra-abdominal pressure, causing sympathetic excitation and reflexively leading to a faster heart rate, which can usually be relieved after rest. This change is physiological. 2. Low blood pressure: For those who have low blood pressure due to physical weakness and other reasons, the decrease in intra-abdominal pressure after urination will lead to a further decrease in the volume of return blood, resulting in a faster heart rate, and dizziness and other manifestations may occur at the same time. 3. Hypoglycemia: Hypoglycemic people may also have a faster heart rate after urination, and may experience dizziness, sweating and other manifestations. There may be other reasons why the heart rate increases after urination, so patients should consult the doctor for timely examination and early treatment.