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.

The heart is a pump that is designed to force blood through the body and as with any type of pump, it works by generating pressure. In the body, the blood is pumped through the arteries to all major organs, but if there is too much pressure it can put a strain on the heart itself or the arteries, causing all sorts of problems.

Blood pressure is dependent on two things. The first is the force with which the heart pumps the blood around the body, and the second is the narrowness of the arteries. Hypertension happens when the blood is forced with increased pressure through the arteries.

When blood pressure is measured, it is done so using two numbers, an example being 120 over eighty. The first number listed is the systolic blood pressure which is the maximum pressure exerted on the arteries when the heart beats, and the second number listed is the diastolic blood pressure, or the minimum amount of pressure on the arteries when the heart is relaxed. The example above is of a normal blood pressure reading.

Blood pressure can be considered high when the systolic blood pressure reading is constantly above 160, and/or the diastolic blood pressure reading is above 100. One of the biggest problems with high blood pressure though, is the fact that it doesn’t always cause any symptoms meaning it may go unnoticed until a later complication such as a heart attack or stroke.

Other complications arising from high blood pressure can be an aneurysm, heart failure, eye damage, kidney failure or atherosclerosis, which is the narrowing of the arteries. Some factors that could contribute to high blood pressure include hereditary reasons, obesity, kidney disease, diabetes, excessive salt intake, lack of exercise and high intake of alcohol.

High Blood Pressure

HIV, or human immunodeficiency virus, is the virus which can lead to AIDS. There are many ways to contract this virus, with the most common being through unprotected sex and the sharing of needles.

People who are infected with HIV may initially not realize there is anything wrong with them as they do not show any symptoms. Nevertheless, some people tend to develop some flu like symptoms which can last for several weeks. Some of these symptoms may include fever, tiredness, loss of appetite, aching muscles and joints, rashes and swollen lymph glands.

HIV Virus Structure

When the virus enters the body, it takes residence in white blood cells that are known as CD4 lymphocytes. The virus takes total control of these cells and starts producing billions of replicas of itself every day.

Once infection of HIV occurs, the body starts to attack the virus and because of this the virus cannot make any copies of itself. This in turn leads to a false sense of wellness as although one would still have HIV, the infected person will begin to look and feel better. Unfortunately, during this period the virus is still attacking the lymph nodes, which are the body’s immune system center.

During the course of ten to fifteen years, the HIV manages to kill so many of the CD4 cells that the body no longer has the ability to fight off infections. Once the CD4 cell count drops below a certain number (200 or lower per mL – the average is 600 to 1000) the sufferer is classed as having AIDS (acquired immunodeficiency syndrome). Once a person has AIDS, the risk of infection form almost anything can cause fatal complications.

HIV Virus Cycle