Overview Von Willebrand disease is a lifelong bleeding disorder in which your blood doesn't clot properly. People with the disease have low levels of von Willebrand factor, a protein that helps blood clot, or the protein doesn't perform as it should. Most people with the disease are born with it, having inherited it from one or both parents. However, warning signs, such as heavy bleeding after a dental procedure, might not show up for years. Von Willebrand disease can't be cured. But with treatment and self-care, most people with this disease can lead active lives. Symptoms Many people with von Willebrand disease don't know it because the signs are mild or absent. The most common sign of the condition is abnormal bleeding. There are three main types of the disease. The amount of bleeding varies from one person to another, depending on the type and severity of the disease. If you have von Willebrand disease, you might have: 1. Excessive bleeding from an injury or after s...