why do we get dehydrated when we are nervous?

·2 min read

The Short AnswerWhen nervous, your body enters a fight-or-flight response, diverting resources away from non-essential functions like digestion and saliva production. This leads to a dry mouth and the sensation of dehydration as your body prepares for perceived danger.

The Deep Dive

The sensation of dehydration when nervous is a fascinating byproduct of our evolutionary survival instincts. When faced with a perceived threat, whether it's a public speaking engagement or a dangerous situation, our autonomic nervous system kicks into high gear, initiating the fight-or-flight response. This is orchestrated by the sympathetic nervous system. It floods our body with hormones like adrenaline and cortisol. These hormones prepare us to either confront the danger or escape it. Part of this preparation involves shunting blood flow away from non-critical systems, such as the digestive tract and salivary glands, and towards our muscles and brain. Saliva, crucial for moistening the mouth and aiding in swallowing, is produced by these glands. When their activity is suppressed, our mouth feels dry, mimicking the symptoms of dehydration. Furthermore, the increased breathing rate and shallow breaths often associated with nervousness can also contribute to fluid loss through respiration, further enhancing the feeling of being parched.

Why It Matters

Understanding this physiological response helps demystify feelings of panic and anxiety. It explains why eating or drinking can feel difficult when you're nervous and why simple actions like sipping water can sometimes help calm the nerves. Recognizing this connection allows for better management of stress-induced symptoms, whether in performance situations or everyday life, promoting a more comfortable and effective response to challenging scenarios.

Common Misconceptions

A common misconception is that nervousness directly causes your body to lose a significant amount of actual bodily fluid, leading to true dehydration. While increased respiration does cause some fluid loss, the primary feeling is due to the reduction in saliva production. Your body isn't actively expelling large volumes of water; rather, it's temporarily ceasing the production of moisture in your mouth. Another myth is that this dry mouth is a sign of a serious medical issue when nervous. In reality, it's a normal, albeit uncomfortable, physiological response to stress.

Fun Facts

  • The fight-or-flight response was first described by Walter Cannon in the early 20th century.
  • Adrenaline, a key hormone in this response, causes your pupils to dilate and your heart rate to increase.