Fatigue in Adults

Common Causes

• Poor sleep habits — Adults may feel fatigued from not getting enough sleep or irregular sleep patterns, which research suggests disrupts energy levels (Mayo Clinic).
• Anemia — Low iron levels might lead to anemia in adults, reducing oxygen delivery to tissues and causing tiredness (NIH).
• Depression or anxiety — Mental health issues like depression could sap energy in adults, making routine activities hard (Cleveland Clinic).
• Thyroid problems (hypothyroidism) — An underactive thyroid may slow metabolism in adults, leading to ongoing fatigue (Mayo Clinic).
• Chronic stress — High stress might wear down adults over time, contributing to low energy (CDC).

Learn More

For a full overview of this symptom, including home remedies and when to see a doctor, read our complete guide on Fatigue.