Are there other mouth conditions that cause halitosis?

Several conditions: Several conditions in the mouth can cause halitosis (bad breath), such as gum disease, dental infections, poor dental hygiene, tonsil infections, multiple oral ulcers, etc...

Yes.: Halitosis (bad breath) can be evident because of cavities, gum disease, bacterial accumulations on and between teeth and on the tongue, tonsil infection, sinus infection, post-nasal drip and even oral cancer, to name a few possibilities. Don't just try to mask it with mouthwash. Have a dentist thoroughly evaluate your mouth. This can be treated.

Yes: When you say other conditions what are the ones you are refering to? Halitosis is usually caused by infections in the mouth...But... It can also come from problems in the stomach.

Halitosis: May have multiple simultaneous causes such as infected teeth, infected gums, failure to floss, failure to brush properly, failure to gently brush tongue, GERD, sinusitis, diabetes, consuming oder producing foods (garlic, cabbage, etc), infected tonsils/adenoids, tonsil stones, many dietary supplements, some medications, post-nasal drip, and so on. See both your Dentist and your Physician.