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Couvade syndrome, also called sympathetic pregnancy, is a proposed condition in which a partner experiences some of the same symptoms and behavior of an expectant mother. These most often include minor weight gain, altered hormone levels, morning nausea, and disturbed sleep patterns. In more extreme cases, symptoms can include labor pains, postpartum depression, and nosebleeds. The labor pain symptom is commonly known as sympathy pain.
Couvade syndrome is not a recognized medical condition. Its source is a matter of debate. Some believe it to be a psychosomatic condition, while others believe it may have biological causes relating to hormone changes.
Symptoms experienced by the partner can include stomach pain, back pain, indigestion, changes in appetite, weight gain, acne, diarrhea, constipation, headache, toothache, cravings, nausea, breast augmentation, hardening of the nipple, and insomnia. A qualitative study listed 35 symptoms from Couvade literature, including gastro-intestinal, genito-urinary, respiratory, oral or dental, generalized aches and pains, and other symptoms.
Psychological causes suggested have included anxiety, pseudo-sibling rivalry, identification with the fetus, ambivalence about fatherhood, or parturition envy.  According to Osvlosky and Culp (1989), pregnancy causes the male counterpart to experience an emergence of ambivalence as well as a reoccurrence of Oedipal conflict. Couvade appears to be more common in conditions where sex roles are flexible and the female is of a dominant status.
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Studies have shown that the male partner cohabitating with a pregnant female will experience hormonal shifts in his prolactin, cortisol, estradiol, and testosterone levels, typically starting at the end of the first trimester and continuing through several weeks post-partum.
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