Crux of Cochrane review: General health checks in adults for reducing morbidity and mortality from disease:

In a review of studies comparing people who go to regular checkups with people who don’t, “We did not find an effect on clinical events or other measures of morbidity but one trial found an increased occurrence of hypertension and hypercholesterolaemia with screening and one trial found an increased occurence of self-reported chronic disease. One trial found a 20% increase in the total number of new diagnoses per participant over six years compared to the control group.”