Alum poisoning can be manifested as dry mouth, bitter taste, numbness of tongue and mouth, dizziness, numbness of hands and feet, nausea and other symptoms. Mild alum poisoning can cause weakness, depression, anxiety, memory loss and other symptoms. Severe alum poisoning may even lead to renal failure and uremia. If excessive alum is deposited in the brain, dementia and Parkinson's disease can also occur. Acute poisoning must be hospitalized immediately. Patients with oral poisoning can gastric lavage, inhibit gastric acid and protect the stomach.