What is a common characteristic of Braxton Hicks contractions?

Braxton Hicks contractions are often referred to as "practice contractions" and occur as the body prepares for labor. One of the defining features of these contractions is that they help tone the uterine muscles and can also stimulate the cervix to prepare for the process of childbirth. Even though these contractions may be uncomfortable, they are typically irregular, infrequent, and not associated with the onset of labor. Their primary function is to assist the body in getting ready for the actual experience of labor, without signaling imminent delivery. This characteristic distinguishes them from other types of contractions that are more indicative of true labor, which are usually painful and more regular in pattern.