etymology - the word couvade comes from the Breton word couver, which means to brood, hatch, or incubate
Couvade syndrome is also called sympathetic pregnancy. It is when the males experience symptoms that mimic those experienced by their partners during pregnancy.
Even physical symptoms like morning sickness can be shared
Some symptoms - nausea, vomiting, heartburn, weight loss, aches, genital or urinary irritation, anxiety, depression, loss of libido,
see also: compathy (symbiotic sharing of feelings)