The difference between cats vomiting hair and asthma:

1. Cats vomiting hair balls will have obvious abdominal contraction movements, but asthma generally does not.

2. When a cat vomits hairballs, it is mainly because the hairballs stimulate the stomach and cause vomiting, while asthma is mainly caused by bronchospasm caused by various reasons.

3. When a cat vomits hair balls, you can see hairs in the vomit, but asthma generally does not cause vomiting.

4. Asthmatic cats will have symptoms such as shortness of breath and lack of energy, and need to be taken to the hospital for diagnosis and treatment.

Factors that may cause cat asthma:

1. Pungent smells, such as perfume, air fresheners, scented cat litter, etc.

2. Items containing unhealthy chemicals, such as newly purchased furniture, paint, or even a new cat nest.

3. Excessive irritating gases, such as smoke generated by burning incense burners often placed in the home by many cat owners or people who smoke at home.

4. Inhalation of dust, especially in spring when there is a lot of pollen outdoors and dust from cleaning the room.

5. Excessive obesity in cats increases the burden on the chest and affects breathing, leading to asthma.