Clotting

He has little clotting factor, so even the tiniest paper cut bleeds and bleeds.

Source: tatoeba (779120)

In actuality, he has hemophilia, a disease that prevents blood from clotting naturally so small cuts can become massive injuries with prolonged bleeding.

Source: tatoeba (11221852)

The doctor was Lawrence Craven. He observed unusual bleeding among children who chewed an aspirin gum to ease pain after a throat operation. Doctor Craven believed they were bleeding because aspirin prevented the blood from thickening or clotting. He decided that aspirin might help prevent heart attacks caused by blood clots in blood vessels.

Source: tatoeba (12265846)

An artificial kidney these days still means a refrigerator-sized dialysis machine. Such devices mimic[…]real kidneys[…]. But they are nothing like as efficient, and can cause bleeding, clotting and infection—not to mention inconvenience for patients, who typically need to be hooked up to one three times a week for hours at a time.

Source: wiktionary