What are the risks of eating undercooked steak?  I tried to cooked medium rare steak for the first time and I did not know about the palm trick to see it the meat is ready. I ate a bite and it was very soft. After I googled and found the hand/palm firmness trick,I realizes my meat was not cooked.  
The risks of eating undercooked steak vary based on the the region, the risk status of the person involved (are they a child, elderly, or immunocompromised in any way).  For normal healthy adults, the risks of eating a single bit of under cooked steak in any of the industrialized nations are fairly small.     Nothing might happen You might suffer from food-borne illness, most likely e coli. from steak, with consequences ranging from:  You might get a "tummy ache" You might suffer flu-like symptoms or vomiting for a few days You might die, but it is quite unlikely    Note that food borne illness normally takes at least 24-48 hours to develop, and is related to the quantity of contaminated food consumed.  One bite is lower risk than a whole meal (lower, not none).    If you are seriously concerned, you should consult your physician.  See also:  Foodborne Diseases Factsheet from Texas state government 