Seasonal fluctuations in acute gastrointestinal bleeding.

We investigated the seasonal variability of upper gastrointestinal bleeding retrospectively during 1988-92 in Haifa, Israel, a city with a subtropical climate. Four hundred and thirty three patients were included in the study: duodenal ulcer, 202; hemorrhagic gastritis 108; gastric ulcer 101; duodenal ulcer and hemorrhagic gastritis 12; and duodenal ulcer and gastric ulcer, 10. The highest incidence of bleeding was observed during winter (31.7%) and spring (28.3%), progressively diminishing throughout summer (18.5%) and fall (21.5%) (p < 0.0001). Both females and males showed this significant seasonal variation (p < 0.025 and p < 0.005, respectively). As a group, patients over 57 years of age had the highest incidence of bleeding during winter and spring (p < 0.005). Interestingly, the ingestion of NSAID had no influence in the increased seasonal bleeding. Duodenal ulcer (p < 0.01) and hemorrhagic gastritis (p < 0.05) showed a significant seasonal variation while gastric ulcer did not. Although there are several reports in the literature concerning seasonal fluctuations in duodenal and gastric ulcers, no such studies have hitherto been published on hemorrhagic gastritis.