Credit Odd Andersen/Agence France-Presse â Getty Images. 1  MOSCOW â President Vladimir V. Putin of Russia and President-elect Donald J. Trump spoke by telephone for the first time on Monday, agreeing to review what both consider the poor state of relations between the two countries, according to a statement from the Kremlin.
Asthma in Children. Asthma in Children. The cause of asthma is unknown. Health experts believe that inherited, environmental, and immune system factors combine to cause inflammation of the bronchial tubes , which carry air to the lungs. This can lead to asthma symptoms and asthma attacks. Family history. Asthma may run in families (inherited).
Some of these may be genetic. However, a number of environmental factors are thought to play a role in the development of asthma. These include air pollution, chlorine in swimming pools and modern hygiene standards (known as the  hygiene hypothesis ). There is currently not enough evidence to be certain whether any of these can cause asthma, although a variety of environmental irritants, such as dust, cold air and smoke, may make it worse.