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Professional
Consumer
MSD Manual
Consumer Version
HEALTH TOPICS
HEALTHY LIVING
SYMPTOMS
EMERGENCIES
RESOURCES
COMMENTARY
ABOUT US
HEALTH TOPICS
HEALTHY LIVING
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Blood Disorders
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Blood Clotting Process
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Blood Clotting Process
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How Blood Clots
Blood vessel factors
Platelet factors
Blood clotting factors
Stopping clotting
Medications and blood clots
Bruising and Bleeding
Causes
Senile purpura and purpura simplex
Common causes
Less common causes
Evaluation
Warning signs
When to see a doctor
What the doctor does
Testing
Treatment
Essentials for Older Adults
Key Points