Bronchitis is the inflammation of the bronchial tubes (airways) in the lungs. This condition causes excessive mucus to be secreted into the tubes and narrowing or closing the bronchial tubes. People suffering from bronchitis may experience wheezing, chest pain, and shortness of breath. Persistent cough with thick, discolored mucus is the most common symptom.

BMI or body mass index, is the measure of body fat with respect to your height and weight. It is important to get your BMI checked, as it is responsible for your physical fitness. It is applicable for everyone over the age of 20. BMI was derived from a mathematical formula.

Body mass index is an approximate index that tells if a person is at a healthy body weight. So what is BMI calculator? A BMI calculator combines the height and body weight to give a number. This number is the body mass index. There are BMI calculators that can be used online as well.

The exact cause of one of the most common respiratory disorders, asthma, is not known. In most cases, it appears that a family history of allergies and environmental factors play an important role. The immediate cause of asthma is the inflammation of the walls of the bronchi which allows air to the alveoli part of the lungs.

Asthma is one of the respiratory disorders of the lungs and has a periodic aggravation. Very quick acting medicines are needed to control these episodes and provide relief to the patient. These are called rescue medication. This group contains quick, short acting bronchodilators called short-term beta agonists. Another group of medicines used for asthma treatments give relief within minutes.

Emphysema is an oppressive respiratory disorder which results from the disintegration of the alveoli, i.e., the tissues where the interchange of gas with blood takes place. Destruction in any large scale will reduce the gas transfer area and the process of gas transfer itself, leading to oxygen starvation or hypoxia.