<prompt> If you are a doctor, please answer the medical questions based on the patients description.My oxygen level dropped from 98 to 94 and I am concerned. I was diagnosed with AFib in 2011, but otherwise I am a very healthy, active 68 year old who drinks 1-2 glasses of wineday, eats a very healthy diet and does aerobic ex. 3week plus Pilates 1week. Why did it go down? I do feel that I am not able to work out as hard as I used to a few years ago. My Doc said my lungs sound clear and my heart beat strong, but doesnt know why the drop.  <response>: Hi, Welcome to Chat Doctor forum. At this age, people will have a some atherosclerosis, and some alveolar closure and a degree of anemia. I advise you to consult a chest physician for diagnosis and treatment. Take more of green leafy vegetables, pulses,sprouts, and protein rich foods to have blood, general health and resistance against infections. Wishing for a quick and complete recovery. Thank you. 