Hives, for example, come in two types -- acute and chronic -- and are usually caused by your body releasing histamine in reaction to an allergy. Histamine is an organic compound in your body responsible for triggering the inflammatory process.
If you have a checking account, the bank prints your account number on the bottom of your checks as the second number after your routing number. You can have the same account number at different institutions, but not the same account and routing number.
They are followed by a four digit number slightly set off from the others. The first two sets of numbers are your bank routing and checking account numbers; these remain the same from one check to the next. The last set of numbers is the check number and will be different depending on the actual paper check.