From health to diseases

Sometimes our health gets affected because of things that happen around us and we suffer from diseases.

Diseases can be classified in different ways. They can be classified based on - what causes them, what they do inside the body, their symptoms and many other things.

Some diseases are caused by organisms which enter our body (infectious diseases), many others due to environment (Asthma due to air pollution or inhaling smoke from stove while cooking food). Some others are caused by our lifestyles (tension ridden lifestyle tend to cause high blood pressure). Some diseases  are caused by deficiencies of important nutrients (one such example is anemia). The cause of some diseases are not known – eg, cancer.

Here we will talk about diseases that are caused by external agents.