What should you know about mental fatigue?

Mental fatigue may feel like a foggy mind, slow recall, frequent mistakes, reduced attention, or needing longer to finish familiar work. It can follow sustained concentration, emotional strain, poor sleep, illness, dehydration, or a demanding schedule. Burnout, anaemia, chronic fatigue syndrome, depression, and some medicines can also be associated with fatigue, so the symptom does not identify one cause by itself.

Notice whether rest improves the problem, whether it is present on waking, and whether mood, sleep, appetite, pain, or physical stamina have changed.

Break complex tasks into smaller steps, work in a quieter setting, use written reminders, and alternate demanding activities with brief pauses. Keep sleep and meal times steady, drink fluids, and choose gentle activity if it feels safe. Arrange a clinical assessment when symptoms last, return often, or affect study, work, driving, or relationships. Bring a list of medicines and a description of your routine.

Avoid self-medicating with alcohol, borrowed stimulants, or unrecommended supplements; these can disturb sleep or conceal a treatable problem.

Get emergency help for sudden confusion, fainting, new weakness, severe breathing trouble, chest pain, or thoughts of self-harm. Seek prompt advice for a quick decline, persistent fever, severe headache with neurological changes, or exhaustion that leaves you unable to manage basic needs.

Could sleep, mood, medicines, nutrition, or a physical condition explain this? What should I track? Are tests or a referral needed, and what changes would require urgent review?