Hi, thanks for asking from HCM. I can understand your concern. Urine holding will not cause headache until bladder is too much distended. In such case, bladder street sensation can result into visceral type of pain . Visceral pain can cause some unrelated symptoms due to stimulation of vagus nerve/parasympathetic system and release of painkiller substances. These symptoms can be - Headache - Nausea - Vomiting - Sweating in palms and soles - Palpitation - Dizziness In your case, if we want to relate then this is most probable explanation. Another explanation is stress headache . This type of headache is related to mental or physical stress. As you feel stressed due to holding of urine, you start feeling headache. And as soon as the stress factor is gone, you get relief. There is nothing to worry. But holding urine is bad for health. It can cause - urinary infection - Bladder stone - Kidney damage - bladder pressure changes My advise is try to pass urine as early as possible. Hope it will clear your doubts. If still in doubts, do let me know. Thanks, Take care