However, they can rarely cause bowel perforations by inducing volvulus and closed-loop obstruction. Bowel obstruction
Bowel obstruction may occur in up to 0.2 per 1000 per year. A worm may block the ampulla of Vater, or go into the main pancreatic duct, resulting in acute pancreatitis with raised serum levels of amylase and lipase. Occasionally, a worm can travel through the biliary tree and even into the gallbladder, causing acute cholangitis or acute cholecystitis. Allergies
Ascariasis may result in allergies to shrimp and dustmites due to the shared antigen, tropomyosin; this has not been confirmed in the laboratory. Malnutrition
The worms in the intestine may cause malabsorption and anorexia, which contribute to malnutrition. The malabsorption may be due to a loss of brush border enzymes, erosion and flattening of the villi, and inflammation of the lamina propria. Others
Ascaris have an aversion to some general anesthetics and may exit the body, sometimes through the mouth, when an infected individual is put under general anesthesia. Cause
Transmission
The source of infection is from objects which have been contaminated with fecal matter containing eggs. Ingestion of infective eggs from soil contaminated with human feces or contaminated vegetables and water is the primary route of infection. Infectious eggs may occur on other objects such as hands, money and furniture. Transmission from human to human by direct contact is impossible.Transmission comes through municipal recycling of wastewater into crop fields. This is quite common in emerging industrial economies and poses serious risks for local crop sales and exports of contaminated vegetables.
Black palm is a common name for several species of plants in the family Arecaceae, including:

Astrocaryum standleyanum, native to Central and South America
Borassus flabellifer
Normanbya normanbyi (Queensland black palm)