At 37 weeks of pregnancy, abdominal tightness is often caused by painless contractions or false labor, which is a normal physiological phenomenon and generally requires no treatment. Painless contractions, also known as false labor, typically begin around the 28th week of the third trimester. They are characterized by a tightening of the abdomen during contractions but without pain. Initially, they may occur once or twice a day, with the frequency gradually increasing. By the time labor is near, they can occur as often as every 10 minutes or even every 5 to 6 minutes. Afterward, pregnant women often transition from painless contractions to irregular painful contractions. These contractions are irregular, often disappearing during the day and appearing at night, accompanied by noticeable abdominal pain. Typically, after one or two nights of irregular painful contractions, they will transition into true, regular labor contractions. These are characterized by contractions occurring every 5 to 6 minutes, lasting about 10 seconds each, with the pain becoming increasingly severe, indicating the onset of labor. Once labor begins, delivery usually occurs within about 10 hours. For painless contractions at 37 weeks of pregnancy, no specific treatment is usually needed, and monitoring through follow-up visits is sufficient.