Diabetes Mellitus: This condition is characterized by high blood sugar levels, which can lead to increased thirst (polydipsia) and potentially panic due to the body's response to hyperglycemia. The combination of these symptoms, especially in the context of other signs like polyuria (frequent urination), makes diabetes mellitus a leading consideration.

Anxiety Disorder: Anxiety can manifest with a wide range of symptoms, including panic and increased thirst due to dry mouth or as a symptom of the anxiety itself. The psychological aspect of anxiety disorders can lead to heightened awareness of bodily sensations, including thirst.
Dehydration: Dehydration can cause significant thirst and, in severe cases, lead to panic due to the body's distress signals. This could be due to various reasons such as inadequate fluid intake, excessive fluid loss (e.g., diarrhea, vomiting), or environmental factors (e.g., high temperatures).
Hyperthyroidism: An overactive thyroid gland can lead to increased metabolism, which may result in symptoms like increased thirst and anxiety or panic due to the heightened metabolic state.

Diabetic Ketoacidosis (DKA): A serious complication of diabetes, DKA can present with increased thirst, among other symptoms like nausea, vomiting, and abdominal pain. It's crucial to identify and treat promptly to avoid severe consequences.
Pheochromocytoma: A rare tumor of the adrenal gland, pheochromocytoma can cause episodes of panic, hypertension, and other symptoms due to the excessive release of catecholamines (e.g., adrenaline). Although rare, missing this diagnosis could be fatal.
Cardiac Conditions (e.g., Myocardial Infarction): Panic can be a presenting symptom of a heart attack, especially in women. Increased thirst might not be a direct symptom but could be related to medications or underlying conditions.

Addison's Disease: A rare endocrine disorder in which the adrenal glands do not produce enough cortisol and aldosterone. It can lead to increased thirst and other symptoms like fatigue, weight loss, and low blood pressure.
Psychogenic Polydipsia: A condition where individuals drink excessive amounts of water due to psychological reasons, leading to increased thirst and potentially panic due to the body's response to excessive water intake.
Hypokalemia: Low potassium levels can cause muscle weakness, fatigue, and heart palpitations, potentially leading to panic. Increased thirst might be a secondary symptom due to associated conditions or treatments.