White coating on tounge
The only reason Thrush occured to me was because there are lots of illnesses going around right now and they can take many forms. for instance my son got strep throat and instead of me catching the normal strep throat I got beta-strep instead which effected my intestinal track and vaginal tracks. I caught strep there instead of in the throat. So with all of what I call the creaping krud going around you could have caught Thrush instead of say strep or a cold. So asking the doctor to look at it would not hurt. its a simple culture to find out what it is. there are pictures of it on the internet.
Thrush is the widely used term for a common fungal infection caused by Candida albicans. Usually this takes the form of trivial vaginal or mouth infections, although it can affect the body more widely and seriously on rare occasions.
Oral Thrush
This may cause a sore mouth and throat, and as well as redness, it is characterised by white discharge on the surface. Babies, especially those being bottle fed, may suffer from this, as well as adults.
Causes
The cause is a fungus which is found widely in nature (Candida albicans), and indeed, is frequently present in the mouth and motions of people in good health. It seems that it is at periods when the defence mechanisms are down that it actually causes a problem. This can be when physically or mentally "run down", in women either pregnant or on the oral contraceptive pill, in diabetes and people either on steroids, or whose immune systems are suppressed.
Antibiotics, which deplete the naturally occurring bacteria, which are useful to the body, as well as the invading bacteria which they are being used to treat, may disturb the natural balance of the body and lead to thrush developing.