High blood pressure and weak legs may be caused by insufficient blood supply to the brain, hypokalemia, lower extremity venous thrombosis and other reasons. If you have high blood pressure for a long time, it will cause cerebral vascular spasm and thus lead to insufficient cerebral blood supply, which is usually manifested as weak legs, dizziness, numbness of limbs and other phenomena, and it is recommended to go to the hospital for examination and treatment in a timely manner. If long-term use of drugs containing diuretics such as Sulbesan and hydrochlorothiazide may cause increased excretion of potassium ions in urine, thus leading to hypokalemia and causing the above situation, it is recommended to check electrolytes in the hospital and supplement potassium chloride for treatment. If you suffer from hypertension and atherosclerosis, it may cause lower extremity venous thrombosis or lower extremity arterial blood supply insufficiency and other phenomena, resulting in the above symptoms, it is recommended to go to the hospital for lower extremity venous ultrasonography, etc., to clarify the diagnosis of symptomatic treatment.