It's not uncommon to have some weak areas in the wall of the abdomen. Any such area is vulnerable to the strain of various actions. Abdominal weakness may be present from birth or may result from an injury, previous surgery, or simply as a matter of aging.
A parastomal hernia may occur in anyone who has a stoma because the stoma itself is a weak point in the muscle and fascia around the site. However, some factors may increase this risk. These include:
Obesity
Smoking
Persistent coughing
Heavy lifting
Straining during bowel movements
Pulmonary disease
Malnutrition