Cotchin, 27, trained with his Richmond teammates on Tuesday morning just over 24 hours after he sought medical treatment for the migraine, a problem from which he occasionally suffers.
Coach Damien Hardwick admitted to a moment of panic when told his premiership captain had been admitted to the Epworth Hospital.
"The hospital thing came first, so it was always a little bit of a concern," Hardwick said on Tuesday.
"It was a little bit alarming when I heard he was in hospital, but pleasingly enough for us he was discharged pretty early the next day.
