Excessive fatigue can cause a lot of harm to the human body, first of all, it may lead to neurasthenia, continuous physical fatigue will make the human brain dysfunction, mental tension, excessive dreams, insomnia, dizziness, inattentiveness and other symptoms. In addition, it may lead to neck, shoulder, back and leg pain, frozen shoulder and other diseases. Severe cases may even be complicated by heart, liver, kidney and other diseases, like the common sudden death from overwork, it may be complicated by heart disease. Therefore, it is recommended to combine work and rest in life and avoid overexertion.