I wondered my urine pH is frequently low at 6.

The following extract states that the common pH level is 6 and that a vegetarian diet is likely to produce a more alkaline urine. Further that early morning urine is relatively acidic due to lack of oxygenation following lower respiration whilst sleeping .

So if I test later in the day, say about noon and its generally above 6 then that may be fine. I am a bit concerned about the 'Mission' sticks giving a lower reading that UriTest and must get in contact with the suppliers and manufacturers. Will also ask Dr McCormick for half a dozen of the ones they use.

My concern was that I read somewhere that cancer cells create an acidic environment.

From: BBC News

Bicarbonate 'could detect cancer'

The naturally-occurring chemical bicarbonate, used to make baking soda, could help detect cancer using sensitive scanning, research suggests.

Bicarbonate is involved in the body's balancing of acid and alkali.

But cancerous tissue is known to turn it into carbon dioxide.

The Cancer Research UK team found MRI scans were able to track changes in the chemical and therefore identify cancers even in the very early stages.
Almost all cancer has a lower pH, meaning it is more acidic than surrounding tissue.

2008/05/28

From: rnceus.com

"The glomerular filtrate of blood is usually acidified by the kidneys from a pH of approximately 7.4 to a pH of about 6 in the urine."

"A diet rich in citrus fruits, legumes, and vegetables raises the pH and produces urine that is more alkaline."

"During sleep, decreased pulmonary ventilation causes respiratory acidosis. As a result, a first waking urine specimen is usually highly acidic."

For more on the diet see:
ACIDIC URINE - A MUST FOR THE UROSTOMATE NOTE:This site seems to have closed (19th July, 2009)
Please try this site: ctds.info/acidic-foods.html

"Very often a person with a urostomy is told not to drink orange juice, but is not given an explanation as to why. The rationale behind the advice actually applies to anyone who ever has had a bladder infection. Acidic urine tends to keep bacteria in check, thereby reducing the incidence of infection, and decrease crystal formation. But oranges and most other citrus fruits are not used by the body as acid but as alkaline."

For a more detailed explanation and list of foods:
Your Body pH Affects Everything:

" WHAT CAUSES ACID IN THE BODY

The primary cause of an acidic condition in your body is from what you put in your mouth. In other words, what you eat and what you drink. And it isn't how "acid" something may seem when you eat or drink it. It has to do with what is left over when you digest it.

Specifically, does eating or drinking something leave behind an acid or alkaline "ash". For example, I don't know about you but I love seafood. Scallops are one of my favorites. However, when your body digests scallops, it leaves an extremely acid ash. In fact, scallops are one of the most acid foods you can eat.

Unfortunately, a lot of the things most people put in their mouths create an acid ash. These include alcohol, coffee and a lot of flesh protein in your diet. Interestingly enough, stress also tends to create an acid condition in the body."