What is a red flag symptom requiring transport for cases of cystitis?

In cases of cystitis, flank or loin pain is considered a red flag symptom that signals a potential complication, such as a urinary tract infection (UTI) spreading to the kidneys (pyelonephritis). This type of pain typically indicates that the infection may not be limited to the bladder and could require more urgent medical evaluation and intervention. The presence of flank or loin pain, especially if accompanied by other symptoms, suggests that a more serious condition could be developing, warranting immediate transport to a healthcare facility for further assessment and treatment.

Other symptoms like a minor headache, mild fever, or normal urination may not necessarily indicate a severe condition and could be managed less urgently, making them less critical compared to flank or loin pain.