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Photographic data on body and skin condition, blowhole cyamids and rake marks were used to evaluate the health of North Atlantic right whales (Eubalaena glacialis) from 1980-2008. A hierarchical Bayesian model was applied to the data to estimate demographic groups, underlying health status conditions and the population to characterize health patterns and temporal trends. Visual health scores (0-100 scale) (N=48,560) were used to estimate the health of 622 identified right whales on a monthly basis. Most whales’ health scores fluctuated between 70 and 90. Whales in poor condition had health scores >60. Health varied by sex, age-class and reproductive state. The largest annual variability was observed in active reproducing females. Calving females had significantly higher health scores than non-calving females. Population health declined and coincided with a decrease in calving from 1998-2000. Over three generations the health in all demographic groups declined.