Why do I feel nauseous when I run?

Question

First of all, I have been running for around a year, and never before have I felt nauseous. For some reason, during the past week I've gotten nauseous after running for only 20 min. Also, if this helps, I'm not usually out of breath when this happens.

Answer 1

maybe you have just slipped out of fitness and have been unknowingly pushing yourself to hard or the more likely option is you are dehydrated make sure you srink lots of water before and after your run. if its a long run also drink during

hope it helps

Answer 2

It is most likely because you don't eat enough before you run, or you don't drink enough water.  

Answer 3

you're probably dehydrated. you need to drink a lot of water during the day but stop like and hour before you run or you'll get a cramp.

Answer 4

Either you didn't eat enough or drink enough. If eating and drinking before you run doesnt help then you should go see a doctor XD