A bleeding disorder is any condition in which blood fails to clot properly, either because a clotting factor is missing or defective, platelets are too few or don’t work, or blood vessels themselves are fragile. The most common by far is von Willebrand disease (vWD), present in roughly 1% of the population, followed by platelet function disorders. Hemophilia A and B are far rarer — about 1 in 5,000 and 1 in 25,000 male births respectively.
Below is the comprehensive list clinicians actually use, organized the way we think about it in the lab: coagulation factor problems, platelet problems, vessel wall problems, and acquired causes. I’ve included inheritance patterns, typical lab findings, and what treatment looks like for each, plus the specific test results that should prompt a hematology referral.
The Comprehensive List of Bleeding Disorders
1. Inherited Coagulation Factor Deficiencies
| Disorder | Missing/Defective Protein | Inheritance | Approx. Frequency |
|---|---|---|---|
| Von Willebrand disease (Types 1, 2A/2B/2M/2N, 3) | Von Willebrand factor | Autosomal dominant (Type 3 recessive) | Up to 1% of population |
| Hemophilia A | Factor VIII | X-linked recessive | 1 in 5,000 male births |
| Hemophilia B (Christmas disease) | Factor IX | X-linked recessive | 1 in 25,000–30,000 male births |
| Hemophilia C | Factor XI | Autosomal recessive | Higher in Ashkenazi Jewish populations |
| Factor VII deficiency | Factor VII | Autosomal recessive | ~1 in 500,000 |
| Factor X, V, II deficiency | Factors X, V, prothrombin | Autosomal recessive | ~1 in 1–2 million |
| Factor XIII deficiency | Fibrin-stabilizing factor | Autosomal recessive | ~1 in 2–5 million |
| Afibrinogenemia / dysfibrinogenemia | Fibrinogen | Autosomal recessive/dominant | Rare |
Factor XIII deficiency deserves a special mention: it’s the one disorder that produces completely normal PT and aPTT. Delayed umbilical stump bleeding in a newborn is the classic clue.
2. Platelet Disorders
- Immune thrombocytopenia (ITP) — autoantibody-mediated platelet destruction; isolated low platelet count with otherwise normal blood counts.
- Glanzmann thrombasthenia — defective GPIIb/IIIa receptor; normal platelet count but platelets can’t aggregate.
- Bernard–Soulier syndrome — defective GPIb receptor; giant platelets, low count.
- Storage pool disease — platelets lack dense or alpha granules; typically mild mucosal bleeding.
- Drug-induced platelet dysfunction — aspirin, clopidogrel, NSAIDs. The most common platelet problem I see.
3. Vascular (Blood Vessel Wall) Disorders
- Hereditary hemorrhagic telangiectasia (HHT) — recurrent nosebleeds, telangiectasias on lips and fingers, arteriovenous malformations.
- Ehlers–Danlos syndrome (vascular type) — fragile vessels, easy bruising, normal coagulation tests.
- Scurvy — vitamin C deficiency causing perifollicular hemorrhage and gum bleeding.
4. Acquired Bleeding Disorders
- Vitamin K deficiency — depletes factors II, VII, IX, X; prolongs PT first (factor VII has the shortest half-life, ~4–6 hours).
- Liver disease — the liver makes nearly every clotting factor except von Willebrand factor and factor VIII.
- Disseminated intravascular coagulation (DIC) — simultaneous clotting and bleeding; low platelets, low fibrinogen, high D-dimer.
- Acquired hemophilia A — autoantibodies against factor VIII, usually in older adults or postpartum women.
- Anticoagulant-related bleeding — warfarin, heparin, apixaban, rivaroxaban.
- Acquired von Willebrand syndrome — seen with aortic stenosis, LVADs, and some lymphoproliferative disorders.
For a deeper look at how each of these categories overlaps, see our guide to the different types of bleeding disorders.
Symptoms: What Pattern Suggests What
The location of bleeding tells you more than the amount. This is the single most useful clinical shortcut.
| Bleeding Pattern | Points Toward |
|---|---|
| Nosebleeds, gum bleeding, heavy periods, easy bruising | Platelet disorder or von Willebrand disease |
| Deep joint bleeds (hemarthrosis), muscle hematomas | Factor deficiency — hemophilia A or B |
| Delayed bleeding hours after injury or surgery | Factor XIII deficiency, mild hemophilia |
| Petechiae (pinpoint red dots) | Low platelet count, almost never factor deficiency |
| Bleeding from multiple sites plus organ dysfunction | DIC |
Warning signs of serious bleeding include a severe sudden headache, vomiting, confusion, or unequal pupils (intracranial hemorrhage); black tarry stools or vomiting blood (GI bleed); and a rapidly swelling, painful limb.
The Diagnostic Workup: Tests to Ask For
| Test | Typical Reference Range | What It Screens |
|---|---|---|
| Platelet count | 150,000–450,000/µL | Quantity of platelets |
| Prothrombin time (PT) | 11–13.5 seconds | Extrinsic pathway: VII, X, V, II, fibrinogen |
| INR | 0.8–1.1 (untreated) | Standardized PT |
| aPTT | 25–35 seconds | Intrinsic pathway: VIII, IX, XI, XII |
| Fibrinogen | 200–400 mg/dL | Clot substrate; low in DIC and liver failure |
| Factor VIII / IX activity | 50–150% | Hemophilia severity |
| VWF antigen & ristocetin cofactor | 50–150% | Von Willebrand disease |
Hemophilia severity is graded directly by factor level: severe under 1%, moderate 1–5%, mild 5–40%. Severe patients bleed spontaneously; mild patients may only bleed after surgery or dental extraction.
One critical test: the mixing study. If a prolonged aPTT corrects when patient plasma is mixed 1:1 with normal plasma, you’re dealing with a factor deficiency. If it doesn’t correct, suspect an inhibitor such as acquired hemophilia or a lupus anticoagulant. Our overview of blood coagulation disorders walks through this algorithm in detail.
Treatment by Disorder
- Von Willebrand disease Type 1: desmopressin (DDAVP) releases stored VWF; tranexamic acid for mucosal bleeding.
- VWD Type 2B and Type 3: VWF-containing factor concentrate — DDAVP is contraindicated in 2B.
- Hemophilia A: recombinant factor VIII prophylaxis; emicizumab (a subcutaneous bispecific antibody) has transformed care, including for patients with inhibitors.
- Hemophilia B: recombinant factor IX, including extended half-life products; gene therapy is now approved for selected adults.
- ITP: corticosteroids, IVIG, thrombopoietin receptor agonists, rituximab, splenectomy.
- Vitamin K deficiency: oral or IV vitamin K; prothrombin complex concentrate for urgent reversal.
- DIC: treat the underlying cause — sepsis, obstetric emergency, malignancy — and replace platelets, fibrinogen, and plasma as needed.
Across all of these, avoid aspirin and NSAIDs, keep vaccinations intramuscular-safe with pressure or factor cover, and carry a medical alert card. Detailed management strategies are covered in our article on blood clotting disorders and their management.
When to See a Doctor
- Nosebleeds lasting longer than 10 minutes despite firm pressure, or occurring more than once a week
- Bruises larger than a coin appearing without remembered injury, especially on the trunk
- Menstrual bleeding soaking a pad or tampon hourly, lasting more than 7 days, or passing clots larger than an inch
- Bleeding that restarts hours after a dental extraction or minor procedure
- A swollen, warm, painful joint after minor trauma in a child
- Any family history of hemophilia or von Willebrand disease before planned surgery or pregnancy
Frequently Asked Questions
Can women have hemophilia?
Yes. Female carriers can have factor levels low enough to cause real bleeding, and rare homozygous or skewed X-inactivation cases produce severe disease. Any carrier should have her factor VIII or IX level measured before surgery or delivery — not simply be labeled “a carrier.”
What’s the most common bleeding disorder?
Von Willebrand disease, affecting roughly 1% of people, though only about 1 in 1,000 have symptoms significant enough to be diagnosed. Many women are diagnosed only after years of heavy menstrual bleeding.
Can normal PT and aPTT rule out a bleeding disorder?
No. Mild von Willebrand disease, platelet function defects, factor XIII deficiency, and vascular disorders all produce normal screening coagulation tests. If the bleeding history is convincing, push for specific assays.
Are bleeding disorders curable?
Inherited ones generally aren’t, but gene therapy for hemophilia B and A is changing that picture. Acquired disorders — vitamin K deficiency, drug effects, acquired hemophilia — often resolve completely once the cause is treated.
What should I do before dental work?
Tell the dentist your diagnosis in advance. Most extractions can be covered with tranexamic acid mouthwash plus, when needed, DDAVP or factor replacement. Read more about coagulation disorder causes, diagnosis, and treatment.
Key Takeaways
- Mucosal bleeding suggests platelet or VWF problems; deep joint and muscle bleeding suggests factor deficiency.
- Start with CBC, PT/INR, aPTT, and fibrinogen — then add specific factor and VWF assays.
- Normal screening tests do not exclude a bleeding disorder.
- Most bleeding disorders are highly manageable with modern therapy, and life expectancy in well-treated hemophilia now approaches that of the general population.
