Apart from the general reasons mentioned in webpage, you can choose to cancel your flight for any other unavoidable reason. The airline usually insists on knowing the reason for your cancellation in accordance with Qatar Airways' cancellation policy. Therefore, you can cancel your flights for any reason. Sometimes it may become unavoidable for passengers to cancel their flights. This can be due to a variety of possible causes. Any personal or professional emergency may require you to cancel the Qatar Airways flight. Therefore, to be prepared for such circumstances, it is better that you know the most common reasons why travelers cancel their flights.
https://www.airmonks.com/cancellation-policy/qatar-airways-cancellation-policy