There are many reasons for the elevation of ALT, such as acute and chronic hepatitis, which can damage liver cells and lead to abnormal liver function. Long-term alcohol consumption, gallbladder disease, cirrhosis, liver cancer, myocardial infarction, myocarditis, etc. can lead to elevated ALT. Drugs that damage the liver can also lead to elevated ALT, common drugs include tetracycline, paracetamol, isoniazid, rifampicin, antipsychotics, antitumor drugs, antibiotics, most of the drugs are metabolized by the liver, and prolonged use of these drugs will affect liver function.