Background: Studies have shown that infectious disease outbreaks are often associated with natural disasters, such as floods and excessive precipitation. However, exploring the impact of drought on human health is scarce. This study explored impacts on gastrointestinal medical visits in connection with typhoons, floods and water outage in Taiwan. Methods: Health care data, weather events data (including typhoon, flood and water outage), and meteorological data were obtained from the National Health Insurance Bureau and the Central Weather Bureau, respectively. We measured the monthly average morbidity of medical visits for gastroenteritis, and the associated relative risks (RR) by demographic factors, ambient temperature and climatic events. Results: Monthly medical visits for gastroenteritis were higher during January-March and July-September. Comparing to normal periods, the relative risk (RR) (1.31, 95 percent confidence interval (CI) 1.27-1.33) for a gastrointestinal medical visit was higher during the water outage period, and lower in typhoons and floods (RR=0.944 and 0.934, respectively, both p>0.05). After adjusting for weather events, demographic factors and daily maximum temperature, the relative risk for gastrointestinal medical services increased at higher ambient temperatures. The probability to have medical visits for gastroenteritis was lower in males than in females (RR=0.69, p<0.05). The elderly were more likely to have medical visits for gastroenteritis. Conclusions: Our findings suggest that people are more likely to have medical visits for gastroenteritis in water outage period than in typhoon and flood periods. Higher temperature may increase the probability of gastrointestinal diseases.