A dull, aching pain on the left side of the lower stomach could indicate inflammation, intestinal disorders, infection or abnormal growths, according to Healthline. Dull, aching pain in the lower stomach and abdomen also could be a result of inflammatory or digestion diseases.
Although abdominal and lower stomach pain can be generalized and travel to both sides, pain that is isolated to the left side could indicate severe conditions such as cancer, ovarian cysts, appendicitis, Crohn's disease, kidney infections and types of cancer, according to Healthline. If the pain is focused on the upper left side of the stomach, it may be due to injury, fecal impaction, an enlarged spleen or a heart attack.
Diseases with symptoms that include dull, aching pain in the lower stomach include gastroesophageal reflux disease, types of the flu, irritable bowel syndrome, lactose intolerance and Crohn's disease, also known as inflammatory bowel disease, according to Healthline. Additional causes of pain in the abdomen and left, lower stomach area include diarrhea, constipation, vomiting, kidney infections and stress.
Women often experience dull, aching pain in the lower stomach during menstruation with an onset of cramps, according to Healthline. Various infections in the blood, throat and intestines stimulate bacteria that enter the digestive tract, which can cause lower abdominal and stomach pain.