Illness is used to describe a person who is in a poor state of health. A disease is an abnormal condition that affects the body of an organism, often caused by pathogens.

Influenza, commonly known as the flu, is caused by the RNA viruses of the family Orthomyxoviridae. The common cold, on the other hand, can be caused by over 200 different viruses. The most common virus blamed...

An epidemic is where there are numerous breakouts of a single disease. A pandemic, on the other hand, is when the disease starts to spread on a larger scale than an epidemic. A pandemic is essentially a bigger...

AIDS (Acquired immune deficiency syndrome) is a sexually transmitted disease that is caused by HIV (Human Immunodeficiency Virus). HIV is a virus that causes a body’s immune system to weaken.

A blackhead looks like an embedded black pocket on the skin. However, some blackheads can be yellowish in color. A pimple appears as a bump on the skin, which looks red and swollen.