Ovarian hyperstimulation syndrome (OHSS) is a known iatrogenic complication of assisted reproductive techniques. Spontaneous OHSS in the absence of ovulation induction is very rare, which can be more rarely complicated by ovarian torsion. Prompt diagnosis of ovarian torsion is desirable to preserve the viability of ovary. However, the background of OHSS can make it difficult to diagnose ovarian torsion. A careful evaluation of ovary on ultrasound can make a diagnosis of ovarian torsion. Intestinal obstruction is also rare in pregnancy. We describe a rare case of spontaneous OHSS in pregnancy presenting with torsion and intestinal obstruction, which was diagnosed on ultrasound.