Rapid increase in muscle size and strength that seems unusually fast
Very low body fat with prominent muscle definition
Severe acne, especially on the back, shoulders, or chest
Sudden mood changes, irritability, aggression, or unusual confidence
Noticeably enlarged traps, shoulders, and upper body compared with the rest of the physique
Stretch marks from fast muscle growth
Water retention or a puffy appearance
Hair thinning or male-pattern baldness that appears or worsens quickly
Gynecomastia or swollen chest tissue in males
Shrinking testicles or reduced fertility in males
Deepened voice or increased facial/body hair in females
Menstrual changes or missed periods in females
Frequent injuries or tendon problems despite strong muscles
Unusual training intensity and recovery that seems beyond normal
Possession or use of syringes, vials, or injectable medications without a clear medical reason
Use of multiple bodybuilding drugs or “cycle,” “blast,” or “PCT” language
Lab results showing abnormal hormone levels, liver enzymes, or cholesterol
A medical diagnosis or prescription for anabolic steroids from a clinician