What harm does excessive lead do to the health of middle-aged people?

The damage of lead to human body is mainly manifested in nervous system, digestive system and blood system, mostly chronic mild poisoning with mild symptoms, especially neurasthenia syndrome.

Common symptoms:

1. Symptoms of nervous system: neurasthenia syndrome, headache, dizziness, dreaminess, memory loss, fatigue, muscle joint pain, etc. In severe cases, peripheral neuritis may occur, manifested as limb sensory and motor disorders, and in severe cases, toxic encephalopathy may occur, causing mental disorders.

2. Symptoms of digestive system: Mild poisoning may cause indigestion, epigastric discomfort after meals, belching, nausea and abdominal pain. Abdominal colic may occur in acute poisoning or chronic poisoning. Abdominal pain is mostly around the navel or lower abdomen. When it occurs, the pain is severe and unbearable, hence the name' lead colic'. At present, typical lead colic is rare. If the oral hygiene is not good after exposure to lead, blue lines often appear on the gingival margin, which are called lead lines and are formed by the accumulation of lead sulfide particles.

3. Hematological symptoms: mainly anemia, usually hypochromic large cell or small cell anemia. Due to anemia and vasoconstriction of facial skin, pallor may appear, which is called' lead capacity'.

4. Damage in other parts: Kidney damage may occur in lead poisoning, and protein, red blood cells and casts can be seen in urine in a few cases. Often accompanied by high blood pressure. Female patients may have irregular menstruation, miscarriage and premature delivery.

Lead is a gray-blue metal with a melting point of 327 degrees. When heated to 400-500℃, the vapor of lead will escape and condense rapidly in the air. It will be oxidized into smoke and spread in the air, brought into the digestive tract, dissolved and absorbed.