Rare diseases · Sign or symptom
Abnormal thrombosis
Abnormal blood clot
HP:0001977
What it means
Venous or arterial thrombosis (formation of blood clots) of spontaneous nature and which cannot be fully explained by acquired risk (e.g. atherosclerosis).
Rare diseases that can present with this18
Common30–79%
5Sometimes5–29%
9- CLOVES syndrome
- Congenital factor XII deficiency
- Extracranial carotid artery aneurysm
- Homocystinuria due to methylene tetrahydrofolate reductase deficiency
- Overhydrated hereditary stomatocytosis
- Primary myelofibrosis
- Pulmonary arteriovenous malformation
- Scedosporiosis
and 1 more in this range
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Abnormal blood clotting
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.