Dizziness and leg weakness can be caused by a variety of factors, such as overwork, resulting in the cerebral cortex nerves in a state of long-term excitation, affecting the blood supply of the lower limbs, thus appearing dizziness and leg weakness, appropriate rest should be relieved. This phenomenon is mostly seen in cardiovascular and cerebrovascular diseases, cerebral blood supply due to insufficient, as well as when the human body is dehydrated, there can also be dizziness and soft phenomenon, no improvement after resting is recommended to consult a doctor in a timely manner: 1, physiological phenomena: 1, excessive fatigue: overwork, excessive labor leads to excessive energy consumption, cerebral cortical neural dysfunction, leading to dizziness, leg weakness; 2, poor sleep: easy to induce cerebral vascular spasm, so that the brain is in a Ischemia, hypoxia, coupled with blood pressure fluctuations, can also lead to dizziness and leg weakness. Second, pathological phenomena: 1, low blood pressure: often due to cerebral, cardiac, renal and other important organs ischemia dizziness, black eyes, limb weakness, etc., dizziness can be intermittent; 2, insufficient cerebral blood supply: cervical spine degenerative lesions of long-term compression of blood vessels, nerves, can cause insufficient cerebral blood supply, weakness of the legs of the phenomenon. When you have a cold and fever, nasal congestion can easily cause insufficient blood supply to the brain and dizziness. When the body temperature gradually rises, the temporary loss of calcium ions due to sweating can lead to leg weakness; 3. Anemia: anemia leads to insufficient oxygen supply to the whole body, which can lead to dizziness and leg weakness; 4. Diabetes mellitus: the main characteristics of polydrunkenness, polyuria, polyphagia, and emaciation can occur when cerebral vascular involvement can cause mild headache, intermittent dizziness, and transient blindness, Hypotonic dehydration: Due to severe dehydration caused by severe vomiting, diarrhea, high fever, heavy sweating, etc., nausea, vomiting, dizziness, blurred vision, weakness of limbs and other phenomena can occur.