Dr. Hanif warmly welcomes you! Thanks for consulting at my virtual clinic. I have carefully worked through your case, and can well realize your health worries. Being your physician, I want to assure, I will take care all of your medical concerns. It may be due to low blood pressure, orthostatic hypotension, anemia, diabetes, thyroid disease, musculoskeletal abnormalities, or other blood disorders. Prognosis of the disease is very good in such cases if diagnosed early and started a proper treatment regimen. He needs to consult a physician who will rule out the above mentioned causes by running a battery of tests on him. It includes but not limited to blood work and radiological investigations. Physician will treat him accordingly. Hope I answered all of your questions. In future, if you need further, detailed and quick assistance on any health issue, feel free to ask me a question by writing my name as a reference in the start of your question. I will get back to you right away. Have a wonderful time ahead. Regards! DR. MUHAMMAD HANIF USA