This paper investigated whether there is a correlation between heart problems and the atmosphere parameters and the correlation between heart problems and thunderstorms. Research is carried out in cooperation with the Rijeka Clinical Hospital Center (KBC Rijeka). Period for which the data were taken are January, April, July and October 2014, and October 2019, in the area of Primorje-Gorski Kotar and Istria counties. Atmospheric data parameters were obtained from the database of the State Hydrometeorological Institute (DHMZ), and the data on heart problems were taken from the database of KBC Rijeka. In this research the dependencies of arrhythmia, pulmonary edema and acute coronary syndrome were observed about mean daily pressure, mean daily relative humidity and mean daily temperature, and the duration of thunderstorms, in the same day, and with a shift of one and two days. Also, the dependence of the daily occurrence of arrhythmia's, pulmonary edema and acute coronary syndrome was also observed about the absolute value of the change in mean daily pressure, mean daily temperature and mean daily relative humidity, in real time, and with a shift of one and two days. From the conducted analysis some relatively small p values (<0.05) were obtained from the investigated dependencies, and Spearman's correlation coecient of almost 0.2. Considering the small amount of data (5 months), p value by which the statistical signicance of each of the calculated correlations would be determined, wasn't determined. The only thing that can be said so far is that if there is an eect, it is small, and that in some cases there are indications of a possible correlation. What is needed to make more precise conclusions is to repeat this research but with a much larger number of data.