False labor
False labor was a condition that female mothers underwent during pregnancy in which they experienced contractions before going into full fledged labor. 

In 2378, B'Elanna Torres woke up early in the morning on the  and told her husband, Tom Paris, that their child was coming. The two went to sickbay and The Doctor scanned Torres with a medical tricorder, determining that she was experiencing false labor, which was common in Klingon pregnancies. She experienced the condition at least three times before finally giving birth. ()

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Medical conditions
Sex and reproduction