The reason we catch a cold are usually related to hygiene and compromised immune systems. People with illnesses such as diabetes catch common colds very easily because of the susceptibility of the body. Some kinds of colds are contagious while others come with weather and temperature variations. Environmental factors other than temperature changes are pollution from vehicles, detergents, perfumes, cleaning liquids and certain cold foods such as ice cream. The most common cause for getting colds remains the lack of practice in keeping up with simple hygiene such as hand washing. Allergens in the air during spring and fall seasons are next to hand washing in starting the colds and coughs. Sometimes the kinds of materials that we use in clothes like synthetic and polyester could start a sneeze and if your immunity is not high could lead to cold and eventually becomes a cycle that could go on. Common colds usually last anywhere from three to seven days and some times longer to subside.