Why am I always tired?
Last updated September 3, 2026.
The most common causes of constant tiredness are unglamorous: short or broken sleep, stress, inactivity, alcohol, and caffeine - audit those honestly before hunting for disease. Two weeks of steady sleep, daily walking, less alcohol, and no afternoon caffeine fixes more fatigue than any supplement. If that changes nothing, the testable suspects are real: iron-deficiency anemia, underactive thyroid, diabetes, depression, sleep apnea (especially with snoring), medication side effects, and post-viral fatigue. See a doctor for weeks of unexplained tiredness, and sooner with red flags: unintentional weight loss, night sweats, breathlessness on mild effort, or new heavy periods. Pymander is a free AI doctor, 24/7 by text, and can help you triage the pattern and prep which labs to ask about.
What to do
- Run a two-week sleep and habit audit: schedule, alcohol, caffeine timing, and daily movement.
- Note the companions: snoring, low mood, heavy periods, and weight change each point at a different cause.
- Ask about the basic lab panel: blood count, thyroid, and glucose catch the common medical drivers.
- Do not normalize red flags: weight loss, night sweats, or breathlessness on mild effort mean get seen.
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