Sudden asthma-like symptoms in cats may be caused by a variety of reasons. The following are some possible causes: 1. Environmental factors: For example, allergens in the air, such as dust mites, pollen, etc., or excessive temperature changes may cause asthma-like symptoms in cats.

2. Disease factors: including but not limited to asthma, heartworm, congestive heart failure, respiratory infection, anemia, trauma , neurological diseases, abdominal enlargement and excessive pain, infectious peritonitis, heart-related diseases in cats, and poisoning caused by cats accidentally ingesting certain things such as rat poison, lilies, etc.

3. Vigorous exercise: Some weak cats may develop symptoms similar to asthma after doing a lot of exercise.