What common symptom might indicate uncontrolled hypertension?

Persistent headaches are a common symptom that may indicate uncontrolled hypertension. When blood pressure rises to dangerously high levels, it can cause strain on blood vessels and affect the brain, leading to headaches. These headaches can often be more severe and frequent compared to typical tension headaches. Alongside other symptoms, persistent headaches may serve as a warning sign that the body's cardiovascular system is under stress due to hypertension.

The other options, while they can present in various health conditions, are not directly linked to uncontrolled hypertension. Weight gain does not necessarily indicate hypertension but rather relates to other health issues. Excessive urination can be associated with diabetes or a urinary tract infection. Frequent colds are not related to hypertension at all; instead, they are more tied to the immune system's activity and exposure to infections. Thus, persistent headaches are a specific and relevant symptom that points towards the need for assessment and potential management of blood pressure levels.