What causes dry mouth and a parched tongue upon waking in the morning?

Waking up with a dry mouth and sore throat in the morning may have various causes. Physiological factors, such as excessive moisture loss during nighttime breathing, are particularly noticeable when breathing through the mouth or in dry environments. Insufficient fluid intake or dietary habits—such as consuming too much salty or spicy food at night or failing to replenish fluids in time—can also lead to dryness. Medical conditions like diabetes, oral infections, or autoimmune diseases may contribute to this symptom as well. Additionally, certain medications, including antihistamines and antidepressants, can interfere with saliva production and cause dry mouth. Morning dryness is often multifactorial, and individual circumstances should be considered comprehensively. If symptoms persist or worsen, it is advisable to seek medical attention promptly to identify the underlying cause and receive appropriate treatment.