10 SAD Symptoms
Reviewed: Dr. Gromatzky
Symptom #2: Fatigue or Lethargy
Fatigue refers to the gradual feeling of tiredness that can be alleviated with rest. It can be divided into physical and mental fatigue. Lethargy describes a feeling of fatigue, lack of energy, tiredness, or weariness. Both fatigue and lethargy can be seen in patients with depression, seasonal affective disorder, nutritional deficiency, malabsorption, infection, and hypothyroidism, among others.
Fatigue and lethargy are common and nonspecific symptoms that mostly resolve once the underlying cause has been dealt with. Individuals with persistent fatigue or lethargy should seek medical advice as it can negatively impact activities and quality of life.
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