Scientists are genuinely divided on this question.

Not medical advice — just what the research says.

What's still open

What the evidence found 3 findings
Based on 12 sources:
PMC peer-reviewed View
PMC peer-reviewed View
Medical Xpress news View
PMC peer-reviewed View
Frontiers in Immunology peer-reviewed View
PMC peer-reviewed View
PMC article by D da Luz Scheffer peer-reviewed View
ResearchGate publication on exercise and immune cell infiltration institutional View
PMC peer-reviewed View
ResearchGate peer-reviewed View
Science Direct peer-reviewed View
PubMed - Exercise and the Regulation of Immune Functions peer-reviewed View
Based on 15 sources:
PMC peer-reviewed View
The Physiological Society institutional View
PubMed peer-reviewed View
NCBI - NIH peer-reviewed View
PMC peer-reviewed View
ResearchGate peer-reviewed View
PMC (PubMed Central) peer-reviewed View
ScienceDirect peer-reviewed View
Stanford Lifestyle Medicine institutional View
PubMed peer-reviewed View
PMC peer-reviewed View
ResearchGate peer-reviewed View
PMC - Infections and exercise in high‐performance athletes peer-reviewed View
PMC - Exercise versus no exercise for the occurrence, severity, and duration peer-reviewed View
UnityPoint Health - Sweating Out a Cold: Working Out When Sick institutional View
Based on 11 sources:
PMC/NCBI peer-reviewed View
PubMed peer-reviewed View
PMC - NIH peer-reviewed View
ENT Society of Canada institutional View
PMC - NIH peer-reviewed View
PMC - NIH peer-reviewed View
PMC - NIH peer-reviewed View
Heat Health Info institutional View
ResearchGate peer-reviewed View
PubMed peer-reviewed View
ResearchGate peer-reviewed View
What research hasn't answered 2 gaps
PMC peer-reviewed View
PMC peer-reviewed View
Medical Xpress news View
PMC peer-reviewed View
Frontiers in Immunology peer-reviewed View
Sources 19 findings
argumentation Unknown
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tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
tree-leaf argumentation
argumentation Unknown
argumentation Unknown
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Generated by reaso.ai's editorial pipeline: claim restated, scientific consensus classified via 3-run majority vote, 19 findings enriched with attribution and study type, narrative written in neutral voice. No individual researcher has signed off on this specific analysis — see methodology for how the pipeline works. Built with Claude Sonnet by Anthropic. Updated April 16, 2026. How we do this →

Written by AI. Sources are linked for verification.