Everyone feels tired at some point. The signs of physical fatigue are often easy to recognize. Slower movements, heavy eyes, achy muscles, and even frequent yawning are telltale signs that the body is tired. But what about mental fatigue? 

WebMD notes that mental fatigue affects the mind rather than the muscles, which can make it difficult to spot. Identifying mental fatigue is important, as untreated mental fatigue can impair decision-making and performance at work and in the classroom. Anyone can develop mental fatigue, but those who frequently feel overwhelmed by work, school, or personal obligations may be particularly vulnerable. Recognizing the following signs of mental fatigue may prompt those experiencing such exhaustion to take a break and seek help.

  • Mood changes: People suffering from mental fatigue may experience mood changes that would otherwise be considered out of character. Increased irritability, a shorter temper, less patience with others, and more frequent snapping at people are signs of mental fatigue. 
  • Loss of productivity: A noticeable dip in productivity is another sign of mental fatigue. WebMD notes that mental fatigue reduces productivity because tiredness compromises a person’s ability to concentrate. Mental fatigue can also drain motivation. Distractions become harder to ignore when suffering from mental fatigue, which in turn diminishes productivity.
  • Instances of zoning out: Mental fatigue can interfere with a person’s ability to focus on what they are doing. This sense of zoning out can be particularly dangerous, as it can occur even while driving. In fact, WebMD notes a link between mental fatigue and car accidents.
  • Inability to sleep: It may seem counterintuitive that mental fatigue would make it difficult to sleep, but it can. People with mental fatigue may struggle to wind down and stop thinking about work- or school-related tasks at bedtime. That can trigger insomnia. One danger associated with this side effect of mental fatigue is that a lack of sleep can worsen feelings of exhaustion.
  • Increased anxiety: WebMD notes that mental fatigue triggers the sympathetic nervous system, which can lead to anxiety and panic. These feelings may be ever-present.
  • Physical side effects: Some people find it harder to exercise when their minds are fatigued. A 2017 study published in the journal Sports Medicine found that the duration and intensity of a physical task are important factors when considering the potential effects of mental fatigue on physical performance. Researchers identified a shorter time to physical exhaustion and a resulting decline in endurance performance as side effects of mental fatigue.  

Mental fatigue can take a serious toll. Anyone who suspects they are suffering from mental fatigue is urged to contact a healthcare provider.