Stabbing pain in the navel area is known as pelvic pain, and it has multiple causes. Abdominal pain below the belly button can be harmless, such as PMS, also known as premenstrual syndrome, or a sign of fertility; however, the pain might be something far more serious, such as a life-threatening condition, according to WebMD. Belly pain and cramps generally accompany digestive disorders, such as irritable bowel syndrome.
An infected appendix, or appendicitis, may also be the cause, especially if the pain in the lower right abdomen is coupled with vomiting and fever. This disease falls under the category of potentially life-threatening diseases. It's serious and requires a visit to the emergency room where it must be surgically removed or it burst and spread throughout the abdomen.
The female reproductive system yields causes that are unique to women, such as ovarian cancer; miscarriage before week 20, which has attendant pain or cramping in the lower back; and menstrual cramps. Meanwhile, colon cancer, which affects the lower part of the digestive system; Crohn's disease, an inflammatory bowel disease similar to irritable bowel syndrome; kidney stones, which affect the urinary tract; and chronic constipation, characterized by infrequent bowel movements, afflict both men and women, according to the Mayo Clinic.