Wheezing is a high-pitched whistling sound heard during breathing. It occurs when air moves through narrowed breathing tubes in the lungs.

Causes :

Asthma

Breathing in a foreign object into the lungs

Bronchiectasis

Bronchitis

Emphysema (COPD), especially when a respiratory infection is present

Gastroesophageal reflux disease (GERD)

Heart failure

Insect stings that cause an allergic reaction

Certain medications

Pneumonia

Smoking

Viral infections