Pica in cats is caused by a deficiency in certain proteins and amino acids, leading to metabolic disorders and the appearance of non-food items. It can also be caused by a lack of trace elements such as calcium, magnesium, phosphorus, sulfur, iron, sodium, copper, cobalt, and manganese, or by gastrointestinal problems. 
How to treat pica in cats
1. Supplement trace elements
Cats often develop pica due to a deficiency in trace elements, so it is recommended to supplement their diet with trace elements as soon as possible.
2. Adjust your diet
If a cat's diet is usually monotonous, leading to nutritional imbalance, it is also very easy for it to develop pica.
3. Clean up any foreign objects.
When a cat suffers from pica, the owner must keep all foreign objects out of the house to prevent the cat from accidentally ingesting them and causing an accident.
The dangers of feline pica
Cats with pica often ingest items like pebbles, plastic, and toilet paper. These items cannot be digested and remain in the digestive tract. Pebbles can easily scratch the mouth and stomach lining, causing bleeding. They can also cause blockages in the esophagus and intestines, leading to loss of appetite.
