Lead poisoning may cause unexplained anemia, constipation and other symptoms. 1. Symptoms. Lead poisoning may cause anemia, constipation, as well as nausea and vomiting, hemorrhage in the fundus of the eye and other symptoms, and may also have an impact on nerve function, memory loss, blurred vision and other symptoms. 2. Harm. Lead poisoning has a greater impact on the patient’s body, and there are many hazards, which will affect the patient’s normal life, and may also be life-threatening. If lead poisoning is not treated in time, it may lead to shock and death. In normal life, we must do a good job of daily health care, and it is best not to frequently contact with heavy metal substances, so as not to lead to lead poisoning. If you experience any symptoms, you should seek medical attention in a timely manner.