More often to have something potent for lunch can become the cause of bad breath, but you must keep in mind that bad breathe can also indicate an underlying health problem.

Here is the list of these possible causes of bad breath that need to be checked by doctor:

1. Sometimes a pus-filled cavity or tooth , or wearing dentures can cause bad breath
2. Smoking and Alcoholism often become the cause of bad breath.
3. Similarly, certain medications also become the cause of bad breath.
4. Bad dental hygiene, gum disease  or an impacted tooth can cause bad breath
5. To lodge some foreign object in the nostril is often a cause of bad breath especially in children its quite common.
6. Taking too much vitamin supplements and pills can cause bad breath
7. Sinusitis or a throat or lung infection sometimes is a cause of bad breath.