Alanine aminotransferase 50U/L is not normal, belongs to the mild elevation, the normal value is below 40U/L, mild elevation is usually physiological or pathological reasons. Physiological causes such as alcohol consumption, fatigue, improper diet and other causes of transient liver injury, often through rest, dietary modification can be restored; For pathological causes such as viral hepatitis, if the alanine aminotransferase gradually returns to normal after active treatment of the cause of the disease, it is not serious, but if it still does not improve or even rises, further examination and targeted treatment are needed. When the patient’s alanine aminotransferase is 50U/L, after excluding physiological causes, it is recommended to consult a doctor in time for targeted treatment under the guidance of the doctor.