Accompanying symptoms typically associated with a bad taste in the mouth include too much saliva, dry mouth, bleeding gums or bad breath, according to Healthgrades. A person may also experience flu-like symptoms, such as cough, headache, sore throat and fever, or changes in facial movements caused by facial nerve dysfunction.
A bitter taste in the mouth may manifest on its own or with accompanying symptoms, depending on the underlying cause, notes Healthgrades. Some people experience a clogged nose, poor sense of smell, vomiting or swollen tonsils. Ingestion of a harmful plant or substance is a life-threatening condition that requires immediate treatment by a health care professional. Its symptoms include sudden swelling of the tongue, lips or mouth; garbled speech; paralysis; difficulty in swallowing; or breathing trouble.
Common causes of a bitter taste include a dry mouth, dehydration or breathing through the mouth, states Healthgrades. Some individuals have a higher sensitivity to bitter tastes.
Acid reflux and vomiting typically lead to a temporary bitter taste, says Healthgrades. Pregnant women and people taking antibiotics or other medications are also prone to experience a short-term bad taste in the mouth. Long-term smoking and mouth, nose and head injuries can permanently alter sense of taste.