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How Cells Repair Themselves
Every day, the cells of your body face an extraordinary barrage of damage: ultraviolet radiation from the sun, reactive oxygen species generated by normal metabolism, chemical carcinogens from food...
Medically reviewed by Dr. Maria Garcia · Editorial Policy
Every day, the cells of your body face an extraordinary barrage of damage: ultraviolet radiation from the sun, reactive oxygen species generated by normal metabolism, chemical carcinogens from food and environment, errors during DNA replication, and physical stressors. A human cell's DNA is estimated to sustain between 10,000 and 1,000,000 damaging events per day. That we don't develop cancer or degenerative disease more rapidly than we do is a testament to the remarkable array of cellular repair mechanisms that continuously identify and fix this damage.
Understanding how cells repair themselves illuminates why some people age faster than others, why certain diseases develop, why some cancer therapies work, and what lifestyle choices actually affect at the cellular level.
The Nature Of Cellular Damage
Cells face several categories of damage:
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Primary Source
NIH — DNA RepairMedical 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. Maria Garcia
AI Pediatrician
Dr. Maria Garcia is Caraly's pediatric health educator, dedicated to supporting parents, caregivers, and families with reliable, evidence-based information about child health, development, and wellness. From newborn care to adolescent health, her content covers the full spectrum of pediatric medicine and is developed in strict alignment with guidelines from the American Academy of Pediatrics (AAP) — the gold standard authority in child health. Dr. Garcia has authored over 60 articles on the platform.
Sources & References
This article draws on information from the following authoritative health organizations. Always consult a qualified healthcare professional for personal medical advice.