Fatigue feels like a persistent and overwhelming sense of exhaustion or lack of energy that can be physical, mental, or both. People describe it as constant tiredness, sleepiness, or burnout that does not improve with rest or sleep

. It can affect your ability to perform daily tasks, concentrate, make decisions, and maintain motivation

. Common sensations and symptoms of fatigue include:

• Chronic tiredness or sleepiness that doesn't go away after sleeping

• Physical weakness or a heavy, sluggish feeling in muscles

• Headaches, dizziness, and muscle aches

• Mental symptoms such as brain fog, difficulty concentrating, poor memory, and impaired judgement

• Emotional effects like irritability, mood swings, low motivation, or feeling "flat"

• Reduced reflexes and hand-eye coordination

• Appetite loss and weakened immune function

• In severe cases, hallucinations or profound exhaustion that feels much worse than typical tiredness, sometimes described as energy being completely depleted

Fatigue can vary in duration and intensity, sometimes lasting for days or recurring unpredictably

. It can be a normal response to exertion or stress, but when persistent and unexplained, it may signal underlying medical conditions such as depression, anxiety, fibromyalgia, or other illnesses

. In summary, fatigue is more than just feeling sleepy; it is a deep, ongoing lack of energy and mental clarity that significantly impacts daily life and well-being