Feeling tired all the time

Clinically: Fatigue · also tiredness, exhaustion, low energy, lethargy, always tired

constitutional

unverified These explanations are written to be easy to read and have not yet been checked against a source. The ranges and measurement notes on this page show theirs.

definition unverified

Feeling worn out most of the time, in a way that sleep does not really fix.

Persistent subjective sense of reduced energy or increased effort required for ordinary activity, not relieved proportionally by rest.

caveats unverified

This is the least specific symptom there is. Dozens of lab markers can be involved, and for most people who feel tired the cause is not something a blood test finds at all. Sleep, stress, mood and workload explain far more cases than any of the markers listed here.

No clinical version written yet.

Markers associated with this

This symptom is associated with 14 markers in this resource. These are associations, not causes, and they are listed in no particular order. Most people with this symptom have none of these. A symptom with this many associations is a poor discriminator on its own; it is far more useful read alongside other findings.

low 25-hydroxyvitamin D · non specific · common
high Alanine aminotransferase · non specific · common
Reported in many forms of liver irritation, but far too common to point at the liver on its own.
high Aspartate aminotransferase · non specific · common
high Bilirubin, total · non specific · occasional
high C-reactive protein · non specific · common
low Cobalamin · non specific · common
high Creatinine · non specific · common
low Ferritin · non specific · common
Iron is required for oxygen transport and for cellular energy production.
high Glucose · non specific · common
low Hemoglobin · non specific · common
high Hemoglobin A1c · non specific · common
low Mean corpuscular volume · non specific · common
either Potassium · non specific · occasional
high Thyrotropin · non specific · common