Autonomic dysreflexia (AD) is a dangerous rise in blood pressure that can happen after spinal cord injury. It affects people who have a spinal injury at level T6 or above. AD happens when you have pain or discomfort in the areas of your body that have no feeling. The most common cause of AD is a full bowel or bladder. When you have AD, you have other signs and symptoms at the same time. If you have these symptoms, you need to fix the problem right away. AD is a medical emergency. If not treated, it can cause stroke, heart attack, seizure, and death.