  We investigate the impact of big bang nucleosynthesis (BBN) on the Hubble
tension, focusing on how the treatment of the reaction rate and observational
data affect the evaluation of the tension. We show that the significance of the
tension can vary by $0.8 \sigma$ in some early dark energy model, depending on
the treatment of the reaction rate and observational data. This indicates that
how we include the BBN data in the analysis can give a significant impact on
the Hubble tension, and we need to carefully consider the assumptions of the
analysis to evaluate the significance of the tension when the BBN data is used.
