Studies reveal a decreased incidence of head and neck cancers in individuals drinking four or more cups of coffee daily as much as 39% less in respect to oral and pharynx cancers; but did not appear to show any positive or negative effect on laryngeal cancer.
Mis Hashibe, a lead researcher at the University of Utah, cautions us against drinnking a great deal of coffee, in spite of the fact that the results appear to be positive.
Pointing out that the main risk factors for oral cancers are smoking and drinking alcohol, she sites that the best way to prevent these cancers is to avoid the main risk factors. 
The chair of preventative medicine at the Mayo Clinic, Dr. Donald Hensrud, points out that it was not that long ago that the perception was that coffee had deleterious health effects. Indicating that recent studies have changed our knowledge of the effects of coffee and researchers seem to have come to the conclusion that drinking coffee does not have the negative impact on health that we once thought it did.  Hensrud states that it is difficult to determine how coffee helps in these cancers, but that the 1000 chemical compounds in coffee, including cancer fighting antioxidants, could supply us with a possible explanation.
Coffee appears to have great potential in the treatment of other diseases, as well. Dementia, diabetes, liver disease and Parkinson’s have shown improvement associated with coffee. While the new studies strongly suggest that coffee offers a positive influence, Dr. Dong Shin, a head and neck specialist at Emory Winship Cancer Institute, suggested that coffee is not solely responsible for progress in these diseases. Dr. Shin is concerned that the studies did not address the side effects of coffee. He suggests that a combination approach was a more sensible avenue to take, rather than relying on coffee alone – vegetables, fruits, natural products and tea might have better results than a narrow focus of coffee alone.
Hensrud’s rebuttal revealed that too much coffee could contribute to liver damage and increased blood pressure. Caffeine also can cause insomnia, gastric reflux, heartburn, palpitations as well as other undesirable effects, like irritability. Physiological addiction of coffee creates withdrawal headaches and
Hensrud concluded by cautioning against drinking too much of coffee, as it could contribute to liver damage and increased blood pressure. The caffeine present could also cause insomnia, gastric reflux, heartburn, palpitations and other undesirable effects.
In fact, coffee drinking could be so addictive that withdrawal symptoms could cause headaches. Additionally, it was found that in some cases drinking too much coffee could make it harder to conceive and/or could increase the risk of miscarriage.
The message we have learned here is that moderation is the key and going extreme on either side could cause trouble all around. A healthy dose of common sense, a pinch of logic, along with current information thrown in for good measure is essential to decision making.
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Studies reveal a decreased incidence of head and neck cancers in individuals drinking four or more cups of coffee daily as much as 39% less in respect to oral and pharynx cancers; but did not appear to show any positive or negative effect on laryngeal cancer.