In general, the absorption time for a brainstem hemorrhage clot is around two to three weeks. During this period, several phases must be passed, with the two main ones being the rebleeding phase and the brain swelling phase. Rebleeding often occurs within three days after the initial bleeding. If not treated promptly during this time, it can easily lead to further brainstem hemorrhage, increasing the size of the clot and hindering the later absorption process. The second phase is the peak of brain swelling and vasospasm. During this phase, certain substances released during the absorption of blood vessels and clots can cause swelling and spasms of the surrounding tissues. If this phase is also safely navigated, then subsequent absorption tends to be relatively quicker. However, complete absorption generally requires at least two to three weeks.