There are many different kinds of pest, some which are harmful to humans and may spread disease, and some which are simply irritating or may cause damage to the food in your cupboards, to the very structure of your house. To list the reasons why each of the pests may appear in the first place would take quite some time, so for now we'll focus on the types of pests which are likely to appear and how to get rid of them:

Ants: Ants form huge colonies indoors, outdoors and all over the place. Ants can be extremely difficult to get rid of once they take hold. Many poisons are available on the market to deal with ants and you do not need to call a pest control expert.

Cockroaches: Cockroaches are a major disease carrier. They tend to indulge themselves on anything from human food to biological waste. It is advised to call a pest control to deal with cockroaches.

Bed Bugs: Bed Bugs are a nasty little nocturnal creature which feed on the blood of people unlucky enough to be close enough to where they are hiding. Bed bugs need a pest control specialist to eradicate them.

Wasps: Wasps are not often thought of as pests, but people who have been unfortunate enough to have to spend long periods of time next to a fully operational wasps nest will tell you different. Wasps are unpredictable insects which can sting without provocation, and a nest housing hundreds or thousands of these insects is best gotten rid of rather than put up with. Wasps are easy to get rid of by using off the shelf poisons which is usually applied around the nest.

Mice / Rats: Vermin are disease carriers which feed on human food and may take residence within the home or outside of the home, particularly near dustbins or compost heaps and places which tend to have a ready supply of waste food bits lying around. It is therefore best to try and make sure dustbin bags aren't left strewn around on the floor as vermin will have no problem in gnawing their way through the bag and returning regularly to eat. Various poisons are available to kill vermin infestations, or you can call an exterminator.

It is important that if you have a pet such as a cat or dog, to read the label of the various poisons/chemicals properly. Also be sure to inform the pest control people you have a pet and they can treat your infestations with a poison/chemical which will not harm your pets.