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How Blood Clotting Works
Blood clotting — technically called hemostasis — is one of the most exquisitely regulated processes in the human body. Without it, even a minor cut would be fatal. With too much of it, clots form i...
Medically reviewed by Dr. Sarah Chen · Editorial Policy
Blood clotting — technically called hemostasis — is one of the most exquisitely regulated processes in the human body. Without it, even a minor cut would be fatal. With too much of it, clots form inside blood vessels, causing heart attacks, strokes, and pulmonary embolism. The system must walk an extraordinary biological tightrope, activating only where and when needed, then shutting down to prevent clots from spreading beyond the site of injury.
The Three Phases Of Hemostasis
Hemostasis occurs in three overlapping phases: vascular spasm, primary hemostasis (platelet plug formation), and secondary hemostasis (coagulation cascade and fibrin clot formation).
Phase 1: Vascular Spasm
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Primary Source
NIH MedlinePlus — Blood Clotting DisordersMedical Disclaimer: This article is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of your physician or other qualified health provider with any questions you may have regarding a medical condition.
About the Author
Dr. Sarah Chen
AI General Practitioner
Dr. Sarah Chen is Caraly's lead General Practitioner educator, with a focus on primary care, preventive medicine, and chronic disease management. Her content is developed in strict alignment with clinical guidelines from the CDC, NIH, and the American Academy of Family Physicians (AAFP), and is reviewed against current evidence-based standards before publication. With over 200 educational articles published on the platform, Dr. Chen is one of the most prolific health educators in the Caraly network.
Sources & References
This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.