Pica Eating Disorder in Humans and Animals

The exact cause of pica disorder is unknown, but several factors may contribute to its development.

Pica disorder is a type of eating disorder characterized by the persistent consumption of non-nutritive substances or food items with no nutritional value over at least one month.

People with pica disorder often have an intense craving and compulsive urge to eat items such as dirt, clay, chalk, paper, soap, ice, hair, or other substances not typically considered food. The exact cause of pica disorder is unknown, but several factors may contribute to its development.

It is commonly observed in individuals with developmental disabilities, such as autism spectrum disorder[1] or intellectual disabilities. Nutritional deficiencies, particularly iron, zinc, or other mineral deficiencies, are also believed to play a role in pica disorder. In some cases, it may be associated with certain mental health conditions, such as obsessive-compulsive disorder (OCD) or schizophrenia. Pica disorder can have serious health consequences, including nutritional deficiencies, gastrointestinal complications,

dental problems, and even lead poisoning if the consumed substances contain toxic materials. It can also result in physical harm, such as bowel obstruction or perforation if large or sharp objects are ingested. Diagnosis of pica disorder involves a comprehensive evaluation by a healthcare professional, including a physical examination, blood tests to check for nutritional deficiencies and psychological assessments to rule out other mental health conditions.

Treatment approaches for pica disorder typically involve a combination of medical management, behavioral interventions, and addressing underlying nutritional deficiencies or other contributing factors. Behavioral therapy, such as cognitive-behavioral therapy (CBT), may be utilized to help individuals recognize and modify their eating behaviors and develop healthier coping strategies.

Individuals with pica disorder need to receive appropriate medical and psychological support to address the condition and minimize potential harm. If you or someone you know is experiencing symptoms of pica disorder, it is recommended to consult with a healthcare professional for proper evaluation and guidance.


Pica is not limited to humans; it can also occur in animals. Pica eating disorder in animals refers to the consumption of non-food substances that lack nutritional value. Animals with pica may exhibit a persistent and compulsive urge to ingest materials such as rocks, dirt, fabric, wood, plastic, or other non-edible items.

This behavior can be observed in various species, including domestic pets, farm animals, and wildlife. The causes of pica in animals can be multifactorial and may include nutritional deficiencies, behavioral issues, environmental factors, or underlying medical conditions. Nutritional imbalances, particularly deficiencies in minerals like iron, zinc, or calcium, may contribute to pica-like behaviors in animals.

Psychological factors such as stress, anxiety, or boredom can also lead to the development of pica. In some cases, certain medical conditions like gastrointestinal disorders, dental problems, or neurological disorders may be associated with pica in animals. Pica in animals can have detrimental effects on their health.

Consuming non-food items can cause gastrointestinal obstructions, dental injuries, digestive issues, or poisoning if the ingested substances are toxic. It can also lead to weight loss, malnutrition, or impaired growth and development in severe cases. Diagnosing and treating pica in animals require veterinary intervention. A thorough physical examination, laboratory tests, and imaging studies may be conducted to assess the underlying cause and rule out any medical conditions.

Treatment approaches for pica in animals may include addressing nutritional deficiencies, modifying the animal’s environment to reduce access to non-edible substances, behavioral interventions, and providing appropriate enrichment and stimulation to alleviate boredom or anxiety. Pet owners, farmers, and wildlife experts need to observe and address pica behaviors in animals promptly.

Symptoms of Pica in Dogs
  • Vomiting
  • Diarrhea, loose stool
  • Halitosis (bad breath)
  • Broken teeth
  • Decreased appetite or anorexia
  • Pawing at the mouth/face
  • Gagging or retching
  • Abdominal distension (bloated stomach)
  • Tenesmus (straining to have a bowel movement)
  • Little to no feces was produced
  • A dark, black tarry stool
  • Excessive drooling
  • Coughing
  • Blue/purple mucous membranes in the mouth
  • Visible distress or abnormal behavior

Consulting with a veterinarian can help determine the underlying causes and develop an appropriate management plan to ensure the animal’s well-being.



Footnotes
  1. Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by persistent challenges in social interaction, communication difficulties, and restricted or repetitive patterns of behavior, interests, or activities. ASD encompasses a wide range of symptoms and functional impairments, leading to significant variations in its presentation across individuals. The exact cause of ASD is not fully understood, but it is believed to result from a combination of genetic and environmental factors. Early identification and intervention are crucial for individuals with ASD to support their development, improve social and communication skills, and enhance their quality of life. [Back]

Further Reading

Sources
  • “PICA-CHEW What is Pica syndrome? Eating disorder that leads to cravings for inedible objects” (Updated: 10:51, 13 Dec 2018) https://www.thesun.ie/fabulous/1003577/what-is-pica-syndrome-eating-disorder-that-leads-to-cravings-for-inedible-objects-all-you-need-to-know/
  • American Psychiatric Association. (2013). Diagnostic and statistical manual of mental disorders (5th ed.). Arlington, VA: American Psychiatric Publishing.
  • Serafini, G., et al. (2015). Pica in iron deficiency: A systematic review. Complementary Therapies in Medicine, 23(5), 337-345.
  • Young, S. L., et al. (2008). Pica in pregnancy: New ideas about an old condition. Annual Review of Nutrition, 28, 85-103.
  • “Pica (disorder)” (Updated May 29, 2023) https://en.wikipedia.org/wiki/Pica_(disorder)
  • Sarret, C., et al. (2010). Pica in children: A review. Journal of Pediatric Gastroenterology and Nutrition, 51(3), 341-346.
  • Sigman, M. D. (2006). Pica in individuals with developmental disabilities. Current Developmental Disorders Reports, 3(1), 62-66.
  • “Pica in Dogs” (Apr. 3, 2023) https://www.petmd.com/dog/conditions/behavioral/pica-dogs
  • Buffington, C. A. T., et al. (2006). Risk factors for pica in cats. Journal of the American Veterinary Medical Association, 228(6), 884-887.
  • Dodman, N. H., et al. (1996). Dietary and behavioral risk factors for self‐mutilation and other injurious behaviors in dogs. Journal of the American Veterinary Medical Association, 209(5), 836-840.
  • Fritz, J., et al. (2018). Pica in zoo-housed gorillas: An overview of prevalence, possible causes, and implications. Zoo Biology, 37(3), 209-221.
  • Hart, B. L. (1998). Behavioral manifestations of stress in the cat. Veterinary Clinics: Small Animal Practice, 28(6), 1291-1299.
  • Patronek, G. J., et al. (1996). Animal hoarding: A case report and literature review. Applied Animal Behaviour Science, 47(1-2), 37-49.

Author: Doyle

I was born in Atlanta, moved to Alpharetta at 4, lived there for 53 years and moved to Decatur in 2016. I've worked at such places as Richway, North Fulton Medical Center, Management Science America (Computer Tech/Project Manager) and Stacy's Compounding Pharmacy (Pharmacy Tech).

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