What is a key sign of kidney stones?

A key sign of kidney stones is the frequent or urgent need to urinate. This symptom occurs because when a kidney stone begins to move through the urinary tract, it can irritate the lining of the ureter, leading to increased urgency and frequency in urination. Additionally, as the stone progresses, it may cause difficulty or pain when urinating, but the primary feeling of urgency is significant.

The other options listed do not typically relate to kidney stones. While dry mouth can occur from dehydration or other unrelated conditions, it is not directly linked to the presence or movement of kidney stones. Excessive fatigue and anxiety/restlessness may arise from various medical issues or stress but are not characteristic signs of kidney stones specifically. Focusing on the urinary symptoms and discomfort associated with kidney stones is vital for accurate identification and understanding of the condition.