He had revealed earlier this week that he was airlifted to hospital after collapsing following a training run and was forced to withdraw from the Commonwealth Games in Glasgow.
"It meant a lot to me," BBC Sport quotes Farah as saying. "I was really ill a few weeks ago but training has gone well. Winning the European Championships again really does mean a lot to me.
"I didn't want to let people down after missing the Commonwealth Games - it hasn't been easy.
"I won the 5,000m and 10,000m double in Barcelona in 2010 and I won one title in Helsinki two years ago. Now I'm excited for the 5,000m and I hope to run well again."
Farah has now won four gold medals at the European Championships.