No, TEXTAREA is simply an HTML form element, and should be included in POST.
To check that it's being passed to the handler, do a "print_r($_POST);exit;" at the top and check the output.
What the others are asking about is the data type in the database. Do you have access to the DB, other than through PHP?
We'd be looking for "describe $tablename", or a description that you get when you look at "structure" in PHPMyAdmin ... or similar.