Almost all types of exercise involve an increased need for oxygen and therefore an increase in ventilation or breathing as fuel demand increases, especially during sustained, high-intensity aerobic activities.
The speed and depth of breathing increase as the body strives to supply more oxygen to the working muscles. Then, many people experience a burning sensation in the lungs and trachea and may be frightened.
If you just started or have had a long break, your body is not yet used to the strain of intense activity, which makes you breathe harder when you exercise energy. When breathing through your mouth and not just your nose, the air flowing may dry out the mucous membranes of your mouth and bronchi, resulting in irritation and a burning sensation. With improved fitness, you will adapt to this and feel a minor nuisance, and the feeling, while distracting, is rarely something to worry about, although you should consult a doctor to be sure.
Many people whose lungs burn while breathing during exercise notice that this condition worsens in cold weather, when the air is dry, as it often is in winter. Although breathing in cold air can be particularly uncomfortable, exhaled air heats up to body temperature before reaching the lungs. As a result, the widespread belief that exercises outdoors is harmful to the lungs persists.
Infectious diseases or environmental causes
Suppose you have an acute condition that originates in or affects the lungs or airways, such as bronchitis, pneumonia, or sore throat. In that case, any burning sensation you experience when breathing during exercise may be exacerbated. If you are sick, you should not exercise until you are well again. Suppose you are a smoker or exerciser in an environment with many lung irritants, such as an industrial zone. Then, it would be best to consider removing the source of the physiological ailment by moving indoors or quitting smoking.
Chronic respiratory disease
While several transient diseases that give a burning sensation in the lungs and throat during breathing can interfere with exercise, chronic illnesses also have the same effect. Among the most common are exertion-triggered asthma, in which the respiratory tract contracts during exertion and gives many troublesome symptoms, not only burning but coughing and shortness of breath. Chronic bronchitis and emphysema can cause similar symptoms, so if you have any of these diseases, talk to your GP to make them aware of the details of your exercise program.