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During the third trimester of pregnancy, Braxton Hicks contractions are often noted as a common symptom. These contractions are sometimes referred to as "practice contractions" and can begin as early as the second trimester but become more prevalent as the pregnancy progresses. They are usually irregular and do not indicate the onset of labor; rather, they serve to help prepare the uterus for the eventual process of labor.

Braxton Hicks contractions can be characterized by their infrequent nature and the fact that they typically subside with movement or changes in position. As the body approaches labor, these contractions may become more noticeable, which can lead to confusion for some women as they may resemble true labor contractions.

Other symptoms such as Chadwick's sign, nausea and vomiting, and fatigue, while they may occur during pregnancy, are less commonly associated with the third trimester specifically. Chadwick's sign, which refers to the bluish discoloration of the cervix, vagina, and labia due to increased blood flow, is typically observed in early pregnancy. Nausea and vomiting are more characteristic of the first trimester, also known as morning sickness. Fatigue can occur throughout pregnancy but is not as defining a symptom of the third trimester as Braxton Hicks contractions.