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Handling errors related to Python and SQL transactions during multithreading can be challenging, especially when using the pymssql library. Here are some tips that can help:

1. Use a try-except block: Wrap your SQL queries in a try-except block to catch any SQL-related exceptions that may be raised during execution. This will help you to identify the specific SQL statement or transaction that caused the error.

2. Use separate connections: When using multithreading, it's best to use separate connections for each thread to avoid conflicts and errors. You can create a new connection per thread using the pymssql library.

3. Use transaction management: Transaction management can help to ensure that changes made to the database are consistent and accurate across multiple threads. Pymssql provides a context manager (with block) called transaction that you can use to begin and commit transactions.

4. Implement retry logic: Implementing retry logic can help to handle intermittent errors that may occur during execution. You can use the retry function from the tenacity library to retry a block of code when an exception is raised.

5. Monitor and log errors: It's important to monitor your code for errors and log them for analysis. Pymssql provides a logging facility that you can use to log errors and other information related to your transactions. You can also use the built-in logging module in Python to log errors.

By following these tips, you can effectively handle errors related to Python and SQL transactions during multithreading utilizing the pymssql library.