If I'm sick with the flu at the time of an injury, will my injury be worse than if I was well?

There aren't many studies to answer this question. One study from Yale University School of Medicine looked at trunk muscle patterns in normal, healthy adults compared with patients who have back pain. Health status was included as one variable. Throughout the study, there was no evidence that health status affected how the back muscles contracted. It does make sense that a body with flu-like symptoms may be at increased risk for injury. The immune system and the nervous system are both affected by this type of illness. Aching joints and muscles may not respond to sudden movements normally. An increased risk of injury seems possible, but unproven.

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