A dry throat that persists even when drinking water can be caused by several factors beyond just dehydration. Some common reasons include dry air or climate conditions, allergies, mouth breathing especially during sleep, certain medications, and underlying health conditions like acid reflux or infections. Additionally, drinking water alone might not be enough if the body is not properly hydrated due to poor absorption or if the water quality is poor. Environmental factors like indoor heating or air conditioning that dry out surroundings, or breathing through the mouth can also cause a dry throat sensation despite fluid intake. Effective steps to alleviate this include staying well hydrated with adequate water intake (about 8-10 cups a day), using humidifiers to add moisture to dry environments, avoiding mouth breathing during sleep, and managing allergies or other medical conditions that may contribute to dryness. If the dry throat persists beyond a week or is accompanied by other symptoms, consulting a healthcare professional is recommended to rule out underlying causes like infections or chronic conditions.