Causes of whooping cough
The first symptoms of whooping cough are similar to those of a cold, such as a runny nose, red and watery eyes, a sore throat, and a slightly raised temperature. Intense coughing bouts start about a week later. The bouts usually last a few minutes at a time and tend to be more common at night. Coughing usually brings up thick mucus and may be followed by vomiting. Between coughs, you or your child may gasp for breath – this may cause a "whoop" sound, although not everyone has this. The strain of coughing can cause the face to become very red, and there may be some slight bleeding under the skin or in the eyes. Young children can sometimes briefly turn blue (cyanosis) if they have trouble breathing – this often looks worse than it is and their breathing should start again quickly. In very young babies, the cough may not be particularly noticeable, but there may be brief periods where they stop breathing. The bouts will eventually start to become less severe and less frequent over time, but it may be a few months before they stop completely.