Pressing the abdomen and feeling a big lump may be caused by huge ovarian tumor, inflammation and infection as well as congenital diseases. 1. Huge ovarian tumor: when women suffer from ovarian tumor, a large mass can be touched when pressing the abdomen, which is usually located in one side of the lower abdomen, and accompanied by a feeling of discomfort in the lower abdomen. 2. Inflammatory infections: when there are local inflammatory infections, it may cause inflammatory masses, such as liver abscess, peri-appendiceal abscess, which may be accompanied by low-grade fever, fatigue and dizziness. 3. Congenital diseases: some congenital diseases may cause large abdominal masses, such as congenital choledochal cysts and congenital megacolon. When pressing the abdomen obviously feel the existence of large masses, must pay attention to, early to the hospital, through the perfect relevant examination, clear cause, under the guidance of the doctor for targeted treatment.