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Updated: May 28, 2026
09:18
Electrophysiological Measurements and Analysis of Nociception in Human Infants
Published on: December 20, 2011
Is fetal pain a real evidence?
Carlo Valerio Bellieni1, Giuseppe Buonocore
1Department of Pediatrics, Obstetrics and Reproduction Medicine, University of Siena, Siena, Italy. cvbellieni@gmail.com
Summary
Fetal pain perception is likely in the third trimester, supported by developing nociceptive pathways. Evidence for second-trimester fetal pain is less clear, though not entirely excluded.
Area of Science:
- Neuroscience
- Fetal Development
- Pain Perception
Background:
- Advancements in fetal surgery necessitate understanding fetal pain responses.
- Assessing fetal pain is crucial for ethical and clinical considerations in utero.
Purpose of the Study:
- To review the literature on fetal pain development and perception.
- To investigate the neurological and behavioral evidence for fetal pain across gestation.
Main Methods:
- Conducted a Medline literature search from 1995 using keywords related to fetal pain and neurological development.
- Focused on studies examining nociceptive pathway development and fetal responses to stimuli.
- Included electrophysiological, endocrinological, and behavioral data.
Main Results:
- Most studies indicate fetal pain perception is possible in the third trimester.
- Evidence for fetal pain in the second trimester is less conclusive.
- Early development of spino-thalamic pathways and thalamic connections support potential second-trimester pain perception, countered by cortical immaturity.
Conclusions:
- Fetal pain is strongly suggested in the third trimester.
- The possibility of fetal pain in the second half of gestation cannot be excluded.
- Further research is needed to clarify pain perception in early gestation.
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