1. Inhalation of large amounts of metallic mercury vapor in a short period of time often develops within a few hours, with dizziness, headache, fatigue, low or moderate fever and other systemic symptoms, severe cases may have emotional agitation, restlessness, insomnia, finger tremors or even mental disorders or convulsions, coma, etc. 2. Stomatitis and gastrointestinal symptoms show gingival redness, soreness, erosion, bleeding, oral mucosal ulcers, loose roots, salivation, fishy taste in the mouth. 3. allergic dermatitis Some patients may develop erythema or maculopapular rash after inhalation of mercury vapor or extensive skin contact with mercury vapor, with a tendency to fuse, which usually subsides within 1 to 3 weeks after disengagement and symptomatic treatment. 4. interstitial pneumonia A few severe patients may develop cough, chest pain, dyspnea, cyanosis, etc. The lung texture is thickened, disturbed and blurred on chest X-ray. 5. renal lesions some patients may develop proteinuria, tubular urine and renal dysfunction, with acute renal failure occurring in some severe patients. 6. laboratory tests: urinary mercury, blood mercury is significantly elevated.