Hello, Inability to walk for long time is due to intermittent claudication. It occurs in conditions like peripheral arterial disease, and atherosclerosis. Pain from claudication is usually dull and aching. It may also feel like your muscles are tiring out, or it can feel like a muscle spasm or cramp. A few important points about claudication are that it affects muscles only. The pain should also stop within a few minutes — or even less — once you stop to rest. Diagnostic tests are ankle brachial index, arteriogram, vascular ultrasound, and MRI. Claudication also increases your risk for serious heart and circulatory problems, which is why treatment usually involves preventive measures to avoid those complications. You need to undergo few cerebellar ataxia tests just to rule out cerebellar causes of loss of balance. Treatment includes recommended walking programs which include walking until you feel moderate pain or as far as you can. Rest to relieve pain and walk again. Repeat the walk-rest-walk cycle for 30 to 45 minutes. Walk three or more days a week. The drug Cilostazol, which improves blood flow, may reduce pain during exercise and help you to walk further. Get good control of hypertension. Get good control of diabetes. Use statins for increased cholesterol. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pallavi M., Anesthesiologist