A cough is basically a reflex action so the airways can be cleared of phlegm, mucus and other irritants like dust and smoke. An inflammation of the upper respiratory tract due to a virus could also cause a cough.

Coughing can be symptomatic of many conditions including bronchitis, asthma, the common cold, flu, whooping cough or smoking. There are even some prescribed medicines that can cause coughing such as ACE-inhibitors which are used to treat heart failure.

Sometimes a cough can be a symptom of an underlying serious medical condition such as heart failure, lung cancer, tuberculosis, pneumonia or a pulmonary embolism (which is a clot on the lung). Coughs that have been caused by things like flu or the common cold normally disappear after a few days, but coughs that have been caused by an infection of the lung, such as bronchitis, could persist for several weeks, even after the infection has cleared up and this is due to the inflammation of the airways which usually take a while to clear up.

Cough Mechanism and Receptors

If someone has been suffering from a cough for more than a couple of weeks after having a viral infection, they should go to their doctor for medical advice.

Motion sickness can also be referred to as travel sickness and is caused by recurring movements when traveling.  Symptoms of motion sickness include, feeling sick, headaches, light headedness or perspiration.  The reason for these symptoms occurring is down to the brain receiving mixed messages from what your eyes are seeing outside the mode of transport compared to the messages being sent by the inner ear when these bumps are felt.  Motion sickness can also occur when trying to read while traveling.

Motion sickness can be quite frequent in children but luckily many find this can disappear as they get older. Some people are more prone to motion sickness and can also develop similar symptoms on fairground attractions, particularly those which involve spinning around.  Most sufferers find that the symptoms will disappear once they have completed their journey or finished their fairground ride; for the unlucky few, symptoms can last for a few hours or even longer.

There are some ways to avoid motion sickness symptoms such as sitting in the front of a car or if in the back usually sitting by the window with the window open can help.  It can also help to sleep or just keep eyes closed.  It can also help to keep to simple foods before traveling to avoid nausea.  There are also over the counter medicines which can help to prevent or reduce the symptoms of motion sickness.  These types of medicines are best taken before traveling but can also help if taken during the journey.  Some medicines for motion sickness can cause drowsiness so it is recommended not to drive or work with heavy machines.

First of all we should try and explain what influenza (flu) is. There are three main types: A, B and C, with B and C only infecting humans and influenza A being able to infect humans, animals and birds. The surface of each influenza A virus contains two types of protein, neuraminidase (N), of which there are nine types, and haemagglutinin (H), of which there are sixteen types. Consequently, there are lots of sub-strains of the influenza A virus and they are given names depending on the type of proteins found on the surface. Examples of these sub-strains could be H1N1, H1N2 and H2N3.

Another characteristic of the A strain is that it has the ability to produce new strains – in other words, mutate. It is as these new strains occur that new types of flu are discovered.

Bird flu is a strain of influenza A that affects birds, of which all species can be affected. Whereas wild birds can carry the disease when they migrate, they don’t usually become ill with it whereas poultry birds like turkeys and chickens do become ill. The virus spreads easily between these birds.

Bird Flu

It is the H5N1 virus that is causing all the problems with humans at the moment. This strain has affected birds for almost half a century, but it mutated back in 1997 in the Far East and spread to humans. As of yet this strain of the virus cannot be transferred from human to human, only from bird to bird or sometime bird to human.