don't take it as medical advice but here's my opinion.
Many remain inactive and don't excersice.- it's been known that blood clots can form by being inactive- it happened to a women on a plane once.
I suggest you do some cardio- it will keep the heart strong, blood clean and get you oxygen.
Like others said, go to a doctor and get checked but in many cases it's been known for a fact that 75% of the problems we go to the doc for can be prevented by diet and excersice.