Blood clots are formed by blood clotting after bleeding. Since blood contains red blood cells and platelets, and of course white blood cells, the blood is bright red in the early stages after bleeding, and platelets have a clotting effect, the clots can clot over time and appear dark red or dark black. If over time, old bleeding inside the abdominal cavity may appear black in color or with a bad odor, mainly after a possible secondary bacterial infection. If there is fresh bleeding and blood clots, immediate resuscitation is needed, and if ruptured bleeding from a substantial organ is considered, surgery is needed if necessary, such as intra-abdominal bleeding, increased heart rate, and decreased blood pressure after splenic rupture, and splenectomy is needed in a timely manner.