I am getting pain in knee joint is it osteoporosis or lack of calcium. I am 36 year old male unmarried person. I get tired early when I am doing walk. Or climbing steps. I have doubt please suggest me. Is it osteoporosis or lack of exercise. And one more thing I am suffering from asthma since I am 10 year old. Now also I use to tablets for same not regularly bases. Like as twice in week. I use medicine aerocort inhaler.