OUR HAMSTER IS ABOUT 10 MONTHS...

Question
OUR HAMSTER IS ABOUT 10 MONTHS OLD.  WE HAVE HAD HIM SINCE HE WAS THREE
WEEKS OLD.  WE CLEAN HIS CAGE THOROUGHLY ON A WEEKLY BASIS.  WE FEED HIM
HAMSTER FOOD FROM PETSMART AND EITHER A PIECE OF LETTUCE, CARROT OR APPLE
PRETTY MUCH DAILY.
TONIGHT, WHEN WE TOOK HIM OUT OF HIS HOUSE, WE NOTICED A VERY STRONG ODOR.
THE PART OF THE HOUSE THAT HE SLEEPS IN ON TOP HAD SOME KIND OF REDDISH
SUBSTANCE THAT APPEARED TO BE VOMIT.  IT WAS IN THE CORNER AND MIXED WITH
SOME OF THE SEEDS HE STORES UP THERE.  MY HUSBAND SAID HERBERT (THE
HAMSTER) HAS NOT BEEN MAKING AS MUCH NOISE THE PAST COUPLE OF NIGHTS BUT
TONIGHT WAS PRETTY MOBILE IN HIS BALL.  WHEN WE PUT HIM BACK IN HIS HOUSE,
HE ALSO EXERCISED IN HIS WHEEL.  WE HAVE NEVER GIVEN HIM VITAMINS OR
ANYTHING OTHER THAN WHAT I TOLD YOU ABOVE.  WE JUST LOVE HIM AND WANT TO
KNOW IF WE ARE MISSING ANYTHING OR IF THESE LITTLE GUYS JUST VOMIT
SOMETIMES.  ANY INFORMATION YOU CAN SHARE WITH US WILL BE APPRECIATED.
THANK YOU.  

Answer
Hi there.  Unfortunately, hamsters are very unpredictable and unsturdy pets when ill.  Vomitting is definately not normal and the only two things I can suggest are 1) cut out the vegetables for a bit and see if that is what is upsetting his stomach or 2) take him to your veterinarian.
Hamsters only have a lifespan of 1-3 years, so this could be something terminal.  I wish I could be of more help.
Wishing Herbert well,
Hilary