High-voltage lines are harmful to the human body in two ways: electric shock and electromagnetic radiation. 1. Electrocution: the less severe symptoms only appear pale, headache, dizziness, muscle pain and so on. Severe electrocution will appear respiratory arrest, shock, loss of consciousness and so on. But in general the height of the high voltage line is much higher than the safety distance, so the risk of electrocution is smaller. Because the work needs to contact high-voltage power lines, must do a good job of safety measures to avoid electrocution. 2. Electromagnetic radiation: electromagnetic radiation is usually energy in the form of electromagnetic waves dispersed in the air for a long time in the electromagnetic radiation environment, will make the human body blood, lymphocytes and other changes, resulting in palpitations, insomnia, bradycardia, leukopenia, immune function and other symptoms. In daily life, whether the high voltage line will cause harm to the human body is also related to the voltage, and the distance between the person and the other protective measures (including whether it is a bare line as well as other lines, etc.) and so on. Still, you should stay away from high voltage lines and avoid contact with them to prevent danger. If you experience any of these symptoms, you should seek medical attention.