Vomiting is suitable as a remedy in hot weather and hot climates
In hot areas and hot weather, certain harmful substances are light and thus prone to float, and this is why vomiting becomes a proficient way to discard these mixtures. On the other hand, certain harmful substances in cold areas and in cold weather become thicker and are harder to extract from above. In this case, getting rid of these harmful mixtures is better done by diarrhea.
Getting rid of harmful mixtures is done by pulling them from the farthest exit or by extracting them from the nearest exit. For instance, there are various mixtures that are not stable and seek to either ascend or descend. If the mixture tends to ascend, then discarding it from below is better. If the mixture tends to descend, then pulling it from above is better. When the mixture becomes stable, then discarding it from the nearest exit is better. When the mixture starts to harm the upper organs, it should be pulled down through the lower parts, and vise versa. When these r-mixtures become stable, they should be
discarded from the nearest exit.
This 1s why the Prophet ate had cupping sometimes in his arm vein, sometimes in his head and sometimes on the top of his foot, so that the spoiled blood is discarded from the nearest possible exit.