Von Willebrand disease (VWD) is the most common inherited bleeding disorder, affecting up to 1% of the general population. It occurs when your blood doesn’t clot properly because of a problem with a specific protein called von Willebrand factor (VWF), which helps platelets stick together and form clots. Unlike hemophilia, VWD affects men and women equally, and many people with mild forms go years without knowing they have it.
How VWF Works in Normal Clotting
When you cut yourself, your body launches a chain reaction to stop the bleeding. Platelets rush to the injury site, and von Willebrand factor acts like molecular glue, helping those platelets stick to the damaged blood vessel wall and to each other. VWF also carries and protects another clotting protein, factor VIII, keeping it stable in the bloodstream long enough to do its job.
In VWD, either your body doesn’t make enough VWF, or the VWF it makes doesn’t work correctly. Some people are missing it almost entirely. The result is the same: clots form too slowly or not at all, leading to bleeding that’s harder to stop.
Types of Von Willebrand Disease
VWD is classified into three main types based on what’s going wrong with the protein.
Type 1 is the mildest and most common form. You have lower-than-normal levels of VWF, but the protein itself works fine. Many people with type 1 have mild symptoms and may not be diagnosed until they experience prolonged bleeding after surgery or dental work.
Type 2 involves VWF that doesn’t function properly, even if you have a normal amount of it. Type 2 has several subtypes (2A, 2B, 2M, 2N), each reflecting a different structural problem with the protein. Type 2N, for example, specifically affects VWF’s ability to carry factor VIII, which can make it look similar to hemophilia on initial testing.
Type 3 is the rarest and most severe form. People with type 3 VWD have very little or no VWF at all, which leads to serious bleeding episodes that can include bleeding into joints and muscles, similar to severe hemophilia.
How VWD Is Inherited
VWD is genetic, passed from parent to child through changes in the gene that controls VWF production. The inheritance pattern depends on the type.
Type 1 and most type 2 forms follow an autosomal dominant pattern. That means a child needs to inherit only one copy of the altered gene from one parent to have the condition. If one parent has VWD, each child has a 50% chance of inheriting it. In rare cases where both parents carry the gene, a child has a 25% chance of inheriting two copies, which typically causes a more severe form of the disease.
Type 3 and type 2N follow an autosomal recessive pattern. Both parents must carry one copy of the altered gene (often without having symptoms themselves), and a child must inherit the altered gene from both parents to develop the disorder. That gives each child a 25% chance of being affected. Because both sexes carry and transmit the gene equally, VWD does not skip generations the way some people assume genetic conditions do.
Common Symptoms
The hallmark of VWD is bleeding that’s disproportionate to the injury. This doesn’t always mean dramatic, visible bleeding. Often it shows up as patterns that seem like minor annoyances until you realize they aren’t normal.
Nosebleeds are one of the most recognizable signs. People with VWD tend to get nosebleeds that start without any obvious cause, happen five or more times a year, last longer than 10 minutes, and sometimes require packing or cauterization to stop. A single bad nosebleed doesn’t suggest VWD, but a lifelong pattern of frequent, stubborn nosebleeds is a red flag.
Prolonged bleeding after cuts, surgery, or dental work is another classic symptom. A skin cut that bleeds for more than five minutes, or a tooth extraction site that oozes for more than three hours, falls outside the normal range. Bleeding after surgery can be particularly tricky because it sometimes stops initially, then restarts hours or days later.
Easy bruising is common too, particularly bruises that are large, appear without a clear injury, or show up in unusual locations.
VWD and Heavy Menstrual Bleeding
Heavy periods are one of the most significant and underdiagnosed symptoms of VWD in women. Because heavy periods are often dismissed as “just how things are,” many women with VWD go undiagnosed for years or even decades.
Clinically, heavy menstrual bleeding is defined as losing more than 80 milliliters of blood per cycle or bleeding that lasts longer than seven days. In practical terms, warning signs include soaking through a pad or tampon every one to two hours on the heaviest days, passing blood clots larger than grapes or strawberries, and experiencing flooding or gushing. Many women with undiagnosed VWD develop iron-deficiency anemia as a result of chronic blood loss.
Predictors of significant menstrual blood loss include clots larger than one inch, low iron stores, and needing to change a pad or tampon more than once an hour. If this sounds familiar, it’s worth bringing up with a healthcare provider, because screening for VWD involves straightforward blood tests.
Childbirth also poses risks. VWF levels naturally rise during pregnancy, which can temporarily mask the condition, but they drop again after delivery. Heavy bleeding during or after childbirth is a recognized complication of VWD.
How VWD Is Diagnosed
Diagnosis starts with a personal and family bleeding history, followed by specific blood tests. The key tests include:
- VWF antigen test: measures how much VWF protein is in your blood
- VWF activity test (ristocetin cofactor): measures how well your VWF actually works
- Factor VIII activity: measures the level of factor VIII, since VWF carries and stabilizes it
- VWF multimer analysis: examines the structure of the protein, which helps distinguish between type 2 subtypes
- Platelet aggregation tests: assess how well your platelets clump together
One complication with testing is that VWF levels fluctuate naturally. Stress, exercise, pregnancy, estrogen-containing birth control, and even your blood type can raise VWF levels temporarily. People with blood type O tend to have naturally lower VWF levels. Because of this variability, testing sometimes needs to be repeated before a clear diagnosis can be made.
Treatment Approaches
Treatment for VWD depends on the type and severity, and many people with mild forms only need treatment before surgeries or dental procedures rather than on a daily basis.
The first-line option for many people with type 1 VWD (and some with type 2) is desmopressin, a synthetic hormone that signals your body to release stored VWF into the bloodstream. It’s given as a nasal spray or injection and can temporarily boost VWF levels enough to handle minor procedures or stop a bleeding episode. Not everyone responds to desmopressin, and it doesn’t work for type 3 VWD since there’s no stored VWF to release.
When desmopressin isn’t effective or appropriate, factor concentrates that contain VWF (sometimes combined with factor VIII) can be infused directly into the bloodstream. This is the standard approach for type 3 VWD and severe bleeding episodes in any type.
Antifibrinolytic medications, which prevent clots from breaking down too quickly, play an important supporting role. For people with type 1 VWD who have mild symptoms, an antifibrinolytic alone can sometimes be enough for minor mucosal procedures like dental work. Current clinical guidelines recommend combining antifibrinolytics with desmopressin or factor concentrates for minor surgeries, as the combination works better than either approach alone.
For women with heavy menstrual bleeding, hormonal birth control can help by regulating or reducing periods, and antifibrinolytics taken during menstruation can reduce blood loss significantly.
Living With VWD: Dental and Surgical Care
Routine medical and dental care requires some extra planning, but it’s entirely manageable once you and your care team know what to expect. Dental extractions, for instance, follow a specific protocol: only one or two teeth are removed per appointment so that bleeding can be controlled, and antifibrinolytic medication is typically started the day before and continued for about a week. Local measures like specialized dressings and careful suturing help protect the extraction site.
After any dental surgery, you’ll generally be asked to avoid mouth rinsing, smoking, hard foods, and strenuous activity for at least 24 hours. Observation periods after procedures tend to be longer than for the general population, ranging from a few hours for mild cases to overnight monitoring for people with more severe bleeding tendencies.
For any planned surgery, the key is communicating your diagnosis early. Your surgical team and a hematologist can coordinate to ensure your VWF and factor VIII levels are raised to safe levels before the procedure begins. With proper preparation, people with VWD undergo surgeries of all kinds safely and routinely.