"Breathing issues" refers to difficulties or problems with breathing. It can mean having trouble taking in enough air, feeling short of breath, or experiencing any other issues that make it harder to breathe normally. Full definition
Our cat has suffered with breathing issues for over 3 years. (exclusivelycatsnj.com)
A higher coil count can create a firmer mattress that offers your baby more support for proper alignment of the spine and to reduce the risk of breathing issues from poor posture while sleeping. (howtoadult.com)
This means their noses have narrower nasal passages and it can cause breathing issue for the. (defendingdog.com)