There are a variety of factors that can harden the lower section of the abdomen. In many cases the lower section of the abdomen is hardened due to physical exercise. In other cases it is the sign of health problems. Check with your health care provider to rule out more serious conditions.
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Many exercises can strengthen lower abdominal muscles. Crunches, squats, and sit ups are only a few examples. Many sports also develop the muscles of the lower abdomen. Skating, skiing, snowboarding and skateboarding are all exercises that use the lower abdominal muscles. The abdominal muscles will tighten over an extended period of time.
Inflammation of the peritoneum can result in the hardening of the lower stomach. The peritoneum is a silk-like membrane that covers the internal organs of the abdomen. Infection can be viral, bacterial or fungal. Peritonitis can also be a complication of other internal ailments, such as appendicitis. Stomach hardening during peritonitis is usually accompanied by fever, abdominal tenderness, nausea and diarrhea. Peritonitis sufferers should seek medical attention promptly.
A developing tumor may also cause hardening of the lower part of the stomach. Tumors that grow in the abdominal cavity can place pressure on neighboring organs and even stretch the skin. Tumors also cause a bloated feeling, a feeling of heaviness in the abdomen and a dull pain. Tumors are treated surgically, using radiation or chemotherapy, or using a combination of these methods.