The involuntary trembling of the legs when the toes point to the ground can be caused by both physiological factors such as overworked legs and pathologic factors such as primary tremor. 1. Physiological factors: Physiological factors lead to involuntary trembling of the legs when the patient’s toes point to the ground, mainly due to poor muscle strength and excessive fatigue of the legs. Because when the legs are overworked, they cannot support the balance of the human body, which leads to the involuntary trembling of the legs when the patient’s toes point to the ground. 2. Pathological factors: pathological factors are caused by primary tremor, primary tremor caused by the foot pointing to the ground leg involuntary tremor, that is, because the patient’s mental excess, lack of sleep induced the body to appear action tremor. If there is no timely conditioning, the area innervated by the nerve root will show involuntary shaking and trembling. If you exclude physiological factors, it is recommended that you go to the hospital in time to clarify the cause of the disease and follow the doctor’s instructions for treatment.