Neurogenic conditions involve your nervous system, i.e. your brain, nerves and spinal cord. Multiple Sclerosis, Parkinsonís disease, a spinal disorder or a stroke are examples of neurogenic conditions that can all result in ED.
Vasculogenic conditions alter the flow of blood to the penis. Erectile dysfunction is closely linked to cardiovascular disease, so your doctor might start by looking at this. High blood pressure (hypertension) and diabetes can both cause ED. Diabetes is a condition caused by a surfeit of glucose in the blood that affects both the flow of blood to the penis and the nerve endings in your penis. It is therefore both a vasculogenic and a neurogenic condition.