Internal Parasites in Cats: Symptoms, Causes & Treatment

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Various parasites including ringworms (a fungal infection), intestinal worms, or heart worms. Diagnosis achieved through fecal samples or blood tests for heartworm.

Physical Symptoms

Lethargy, increased appetite or loss of appetite, swollen or bloated appearance to belly, emaciation, poor coat condition, bloody stool, vomiting, diarrhea. Some cats may not show symptoms. Worms or tiny white lines like grains of rice may be present in the stool.


Contact with contaminated or infected fecal material. Heart worms may be contracted with the bite of an infected mosquito.


Consult your veterinarian. Generally, an oral or injected wormer may be prescribed and symptoms may be treated. Advanced cases of heartworms may require surgery.