What causes false contractions?

False contractions, also known as Braxton Hicks contractions, are caused by the body's preparation for labor. They occur as the uterus tightens and relaxes in response to hormonal changes, typically in the second or third trimester of pregnancy. These contractions are usually irregular and painless, serving to tone the uterine muscles and help the body practice for the actual labor process. Stress, dehydration, or increased physical activity can also trigger these contractions.