Abnormal/unusual cultural differences/patterns/syndromes are sorts of disorders or quirks which seem to affect a single cultural group or people of some particular place and are, therefore, often unknown outside of their own regions.
Couvade syndrome is a medical/mental condition which “involves a father experiencing some of the behavior of his wife at near the time of childbirth, including her birth pains, postpartum seclusion, food restrictions, and sex taboos”. The term originally referred to the medieval Basque custom in which the father, during or immediately after the birth of a child, took to bed, complained of having labour pains, and was accorded the treatment usually shown women during pregnancy or after childbirth. In some extreme cases, fathers can grow a belly similar to a 7-month pregnant woman and gain approximately 25 to 30 pounds (“phantom pregnancy”). Other symptoms include and are not limited to developed cravings, suffered nausea, breast augmentation, and insomnia.