Farah fell to the ground shortly after completing the race and was taken away from the finishing area in a wheelchair but later allayed fears for his health.
He said: "I don't remember passing out, but I think it was just I tried so hard in the race, obviously, taking a fall and then going through.
"I'm all right. It's fine. It's no big deal."
The Briton endured a tough run after taking a painful fall after five miles. He recovered to finish in 61 minutes 50 seconds - 18 seconds behind Kenyan Geoffrey Mutai.
Farah, who won 5000m and 10,000m gold at the 2012 Olympics and 2013 world championships, is preparing to run his first full marathon in London in April.
The athlete is due to compete at Hampden at the Diamond League meeting on July 11-12 but has said he will only compete for England at the Commonwealth Games two weeks later if he believes he can win.