Collect information about WILLFACT or WILFACTIN in their real life clinical use and identify the therapeutic practices in an international environment.

Non-interventional, prospective, non comparative, international, multicentre study.

Inclusion Criteria:

• Patients with inherited von Willebrand disease
• Patients treated with WILLFACT or WILFACTIN
• Patient or parent/legal representative who has provided written signed and dated informed consent before any data collection.

Exclusion Criteria:

• Patients who usually do not keep injection log up to date, when treated.

Any patient, whatever their age, with inherited von Willebrand disease