What is Infertility? Infertility risk factors can encompass many factors here are a few interesting statistics.

• About 20% of cases of infertility are due to a problem in the man.
  
• About 40% to 50% of cases of infertility are due to a problem in the woman.
  
• About 30% to 40% of cases of infertility are due to problems in both the man and the woman.
  

Medilexicon's medical dictionary, defines infertility as "Diminished or absent ability to produce offspring; in either the male or the female, not as irreversible as sterility.
" Department of Health and Human Services, USA, states that approximately 10% to 15% of couples in the USA are infertile - meaning they have not conceived after at least one year of regular, unprotected sex.
Apparent infertility may be treatable.
Infertility can be a result of a single cause in the women or the man.
Or it could be the result of a combination of factors relating to both.
Approximately 1/3rd of the causes of infertility are never identified.
Infertility Risk Factors

• Age - after about 32 years old a woman's fertility starts to drop and continues doing so.
  Male fertility progressively drops after the age of 40.
  
• Smoking - smoking is bad for you all the way around.
  There is a considerable increase in the risk of infertility in both men and women smokers.
  The benefits of fertility treatment may be weakened by smoking.
  The risks of a miscarriage are also greater with a woman smoker.
  
• Alcohol consumption - any degree of alcohol can have a negative affect on a woman's pregnancy and alcohol abuse may lower male fertility.
  Reasonable alcohol consumption has not been shown to lower fertility in most men, with the possible exception of men who already have a low sperm count.
  
• Being obese or overweight - a sedentary lifestyle leads to being overweight or obese.
  This has been found to be one of the major causes of female infertility.
  An overweight man has a higher risk of having abnormal sperm.
  
• Being underweight - as with being over weight, being significantly underweight can result in the woman having fertility problems.
  
• Being vegan - a strict vegan must make sure your vitamin and mineral intake of iron, folic acid, zinc and vitamin B-12 are adequate, otherwise your fertility may become affected.
  
• Over-exercising - exercising in excess of seven hours each week may create ovulation problems for a woman.
  
• Not exercising - too sedentary of a lifestyle has been linked to lower fertility in both men and women.
  
• Sexually transmitted infections (STIs) - chlamydia can cause scarring of the fallopian tubes causing infertility.
  Many STIs may also cause infertility.
  
• Exposure to some chemicals - be careful about exposure to pesticides, herbicides and solvents of any kind.
  These have been linked to fertility troubles in both men and women.
  
• Mental stress - female ovulation and male sperm production may be affected by mental stress.
  

The subject of infertility is a very complicated topic and many more factors than those listed above can have an effect.
Cost effective, safe and natural methods for the reversal of infertility are available before looking at the costly medicines and medical procedures.
There are of course those cases that these will be required, but it seems that natural is always the first best choice.