No, down pillows are not necessarily bad for asthma. While some people with asthma may be sensitive to certain allergens, such as dust mites, which can be found in down feathers, it does not mean that all individuals with asthma will have a negative reaction to down pillows.
It is important to note that down pillows can be hypoallergenic, meaning they are designed to minimize the risk of triggering allergies or asthma symptoms. These pillows are often made with special materials or treated to reduce allergens. However, it is always recommended to check the product description or label to ensure that the down pillow you choose is hypoallergenic if you have asthma or allergies. Additionally, regularly washing and maintaining your pillow can help minimize allergens and keep it clean for a healthier sleep environment.