The term 'Fever Cause' can be broken down into three crossword solutions: CABIN, FLU, and MALARIA. CABIN is a five-letter word meaning a small wooden house, usually found in rural areas. FLU is a three-letter word referring to the contagious respiratory illness caused by the influenza virus. Lastly, MALARIA is a seven-letter word referring to a serious tropical disease caused by a parasite that is spread through mosquito bites.