What are some possible causes for a bitter taste in the mouth?

Dysgeusia is a disorder that distorts a person's sense of taste, causing a persistent foul taste in the mouth that can be bitter or metallic, explains Healthgrades. Taking certain medications, such as antibiotics, or being pregnant can also cause a bitter taste to temporarily develop in the mouth.

Dysgeusia can affect people of all ages, and a painful burning sensation may accompany this condition, according to the National Institutes of Health. Dysgeusia is most common in women who are middle-aged and older, and it can develop due to a variety of reasons, including exposure to certain chemicals, radiation treatments, a head injury, poor hygiene or dental problems.