<s>[INST] Hi, I have been experiencing tightness and stiffness in my legs. I do regular exercise by means of walking my dog and have recently found this quite difficult. I feel my legs getting really tight almost as if they are going to burst. They also feel really stiff as if I cant open them properly. Could this be related to my heart? [/INST] Hi Dear, Welcome to Chat Doctor. Understanding your concern. As per your query you have tightness and stiffness in legs. Well there can be many reasons for symptoms you mention in query like nerve compression, diabetes, neuropathy or multiple Sclerosis. If condition doesn't get well then consult orthopedic surgeon for proper examination. Doctor may order blood test or RH factor, CT scan or MRI along with physical examination to confirm the diagnosis. Doctor may prescribe methotrexate, anti-inflammatory, gabapentin long with nerve supplement and recommend physical therapy. I would suggest you to do light stretching exercises along with gentle massage, apply warm compresses on entire leg and take muscle relaxants like orthodox MR. Hope your concern has been resolved. Get Well Soon. Best Wishes, </s>