www.ncbi.nlm.nih.gov/pmc/articles/PMC3690315/
'There is increasing evidence for sex differences in pain sensitivity and analgesic response.
Clinical pain, both acute and chronic, and experimental pain models all show sex differences.
While chronic pain is commoner in women the evidence on pain severity is less clear.
Further study is needed of underlying mechanisms, including the contribution of hormonal and genetic factors.'
pubmed.ncbi.nlm.nih.gov/19411059/
'The growing body of evidence that has accumulated in the past 10 to 15 years continues to indicate substantial sex differences in clinical and experimental pain responses, and some evidence suggests that pain treatment responses may differ for women versus men.'
pubmed.ncbi.nlm.nih.gov/27364392/
'It is becoming very evident that gender differences in pain and its relief arise from an interaction of genetic, anatomical, physiological, neuronal, hormonal, psychological and social factors which modulate pain differently in the sexes. Experimental data indicate that both a different modulation of the endogenous opioid system and sex hormones are factors influencing pain sensitivity in males and females.'