Causes of left-sided abdominal pain in men include constipation, diverticulitis, gas and inflammatory bowel disease, according to doctors at HealthTap. Constipation occurs when bowel movements become less frequent or more difficult, notes Cleveland Clinic.
Constipation is often caused by an insufficient amount of fiber in a diet, explains Cleveland Clinic. Other causes include dehydration, medications, stress and activities that force a person to ignore his urge to empty the bowel. Medical conditions such as colorectal cancer, diabetes and hypothyroidism can cause constipation as well.
In patients with diverticulitis, tiny pockets, called diverticula, form in the lining of the bowel, causing abdominal cramps and tenderness in the affected area, according to Cleveland Clinic. People with diverticulitis may develop complications from the disease, including rectal bleeding, which occurs when the pockets become blocked with waste and infected.
Inflammatory bowel disease describes a group of disorders that cause the digestive tract to become inflamed for too long, notes Healthline. The most common disorders are Crohn's disease and ulcerative colitis, which usually affect the small and large intestine, respectively. There is no single cause for inflammatory bowel disease, but factors such as heredity and an abnormal immune response increase the risk of developing it. Patients with the disease experience symptoms such as diarrhea, weight loss, pain, bloating and anemia.