Is STI Test useful for fatigue?

An STI test can be useful for fatigue if there is a risk of infection (e.g., unprotected sex, multiple partners). Chronic infections like HIV, syphilis, or hepatitis B/C can cause nonspecific fatigue. However, STI testing is not a standard workup for fatigue without risk factors or other symptoms. Evidence is based on clinical experience and case reports, not RCTs for fatigue diagnosis. Many other causes (iron deficiency, thyroid disorders, sleep apnea) are more common. A positive test requires medical treatment; a negative test does not rule out other infections. Caution: home tests may give false negatives during the window period. Consult a physician for personalized risk assessment.