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.

Hair loss is a problem that many people suffer from. There are different types of hair loss affecting both men and women. Whoever suffers from it, whether male or female, hair loss can lead to many issues with self-esteem and confidence. The main types of hair loss suffered by individuals are detailed below.
Male-pattern baldness is the commonest form of hair loss in human beings and is called androgenic alopecia. Although the term androgenic loosely means “of man genus”, the condition can actually affect women as well as men.

Hair Loss Patterns

The next type of hair loss is alopecia areata and this form involves bold patches that tend to come and go sporadically. One in every hundred people is affected by this, with the main group being young people and teenagers. One in every five cases can be attributed to hereditary reasons.

A problem with the immune system is thought to be the main contributor to alopecia areata and there is no effective treatment available for the condition. In most of the cases though, the hair will grow back within a year. One in every five persons affected with the condition go on to develop hair loss in a more severe form, such as alopecia totalis (no hair on the scalp) or alopecia universalis (lack of hair on the body as well as scalp).

Telogen effluvium is another form of alopecia hair loss which is quite common, and the condition can be described as extensive thinning of the hair rather than having specific bald patches. The hair loss in this condition is usually down to stress or a reaction to medication.

Hepatitis B is a virus that affects the liver. It is more prevalent in Asia and Africa and can be either acute (more common), resolving itself relatively quickly with no long term liver damage, or chronic (in about 20% of cases) lasting six months or more, and sometimes even for life with symptoms coming and going randomly.

Hepatitis B is normally transmitted via contact with infected bodily fluids or blood and only a very small amount of blood is required to transmit the disease because it is that infectious. In the developed world the virus is normally spread via sharing of contaminated needles, unprotected sex and the sharing such things as razor blades. In less developed countries where blood products are not screened properly or medical equipment is not sterilized adequately, this can also lead to the spread of the virus.

Hepatitis B viruses have an incubation period of between six weeks and six months, but approximately one third of all cases show no symptoms of the disease at all. In another third of cases, symptoms appear flu-like in nature and can include aches, pains and weakness; fever; headaches; loss of appetite; jaundice; diarrhea; and, vomiting and nausea. In the last third of cases, the virus can cause severe illness that can last for a long time (many months in some cases).

Vaccines are available nowadays against hepatitis B, but treatment for those infected normally includes nothing more than rest and recuperation. Drug treatments may be required for chronic types of the disease, to prevent damage to the liver and other parts of the body.