Symptoms, tests and treatments Symptoms Find out about the different symptoms you may have with a lung condition Symptoms of lung conditions Breathlessness What causes breathlessness and how can you manage it? Phlegm and mucus Find out what phlegm is and what it could mean if yours is a different colour than usual. Signs of breathing problems in children If your child is having difficulty breathing, it can be very worrying. This information tells you what signs and symptoms to look out for, what they mean, what you can do about them, and when you should ask for help. Preschool wheeze Find out what coughing and wheezing in your baby or child might mean, how it is different to asthma, and how you can help your child.