Ketosis symptoms are a result of the way the body gets rid of the excess ketone bodies which build up in the blood stream when a person eats a low carb, ketogenic diet.
In short, the body has three ways of dealing with excess ketone bodies:
The ketosis symptoms associated with the benign dietary ketosis caused by eating a low carb, ketogenic diet are not dangerous. They may differ for each individual, with the most common symptoms being:
If you would like to read more, Jeff Volek and Steve Phinney discuss the new method of checking blood ketones in their book "The Art and Science of Low Carbohydrate Performance" and Volek and Phinney's book The Art and Science of Low Carbohydrate Living is a good introduction the science of ketogenic diets.
All of my books are available in electronic PDF, and now in paperback on Amazon!
If you have started a ketogenic diet and want to be able to check your ketone levels, there are several ways to do this.
You can buy ketone stix, and check the levels of ketones in your urine. This method has been the most common method for years, but recently, several companies have developed a blood ketone meter for home use.
This method of checking ketones in the blood is much more accurate, but is also much more expensive. Jimmy Moore has a nice post on using the blood meters here.
Below are links to the Keto-Stix for urine checks, and the various brands of ketone meters for blood checks.