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However , internal bleeding is just as dangerous as external bleeding ; if enough blood vessels are severed to cause serious injury , the skin 's elasticity will do nothing to prevent blood from exiting the circulatory system and accumulating uselessly in other parts of the body .
 internal bleeding
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 internal bleeding