What is a common symptom associated with diabetes insipidus?

Polydipsia, or excessive thirst, is a hallmark symptom of diabetes insipidus. This condition occurs due to an inadequate secretion of antidiuretic hormone (ADH), which is essential for water reabsorption in the kidneys. When there is insufficient ADH, the kidneys are unable to concentrate urine effectively, leading to the excretion of large volumes of dilute urine. As a result, the individual becomes dehydrated and experiences an intense thirst, prompting the need to drink large quantities of water to compensate for this fluid loss.

Considering the other symptoms listed, insomnia, bradycardia, and constipation are not characteristic of diabetes insipidus. Insomnia is more related to sleep disturbances, bradycardia refers to a slow heart rate, and constipation involves digestive issues, none of which directly connect to the underlying mechanisms of diabetes insipidus. Therefore, polydipsia stands out as the most relevant and common symptom associated with this disorder.