My cat has a hard swollen stomach? Can you please provide the possible cause?

One of our veterinarians will respond to you soon.  As for now, it sounds pretty serious, and definitely not normal.  I suggest you have an examination ($55) and let the doctor actually see what they can find.  Additional tests can be recommended.  We have appointments available Monday morning.  813 988 1189 (near Temple Terrace) or 813 973 8566 (near New Tampa)  or 813 877 6369 (South Tampa) or 813 885 4477 (Westchase)