Medically speaking, bitterness in the mouth is a taste abnormality, not only for oral problems, but also for other physical diseases, and the causes are complex and varied. This seemingly subtle physical discomfort may also lurk big trouble. 1, poor oral hygiene Oral hygiene problems, in addition to causing bleeding teeth, periodontitis, pulpitis, etc., may also bring bad breath, bitter mouth and other unpleasant experiences. Therefore, it is very necessary to brush your teeth every morning and evening, and whether you really do it properly. 2.Life vices There are many causes of bitter mouth, some brain workers, due to work and mental stress, coupled with improper diet, lack of sleep, long-term smoking, lack of exercise and other features, their gastrointestinal function sluggish, eaten food in the gastrointestinal stay too long, it is easy to produce damp heat, will also cause bitter mouth. 3.Vitamin or trace element deficiency Lack of vitamin B12 or zinc may lead to bitterness in the mouth. Vitamin B12 is the only vitamin that needs the help of an intestinal secretion to be absorbed. Once deficient, it tends to cause inflammation and bleeding of the mucous membranes of the tongue, mouth, and digestive tract. Nausea, loss of appetite, and anemia are all symptoms. Zinc deficiency is prone to mouth ulcers, damaged wounds do not heal easily, paranoia, anorexia, etc. 4, nerve damage The sensation of the tongue needs to be transmitted to the brain through the nerves in order for us to know what it tastes like. If a head injury injures the nerves or the brain, or even if you have dementia, it may lead to a misunderstanding of the sensation of taste. 5. Other physical diseases Diabetes, liver disease, kidney disease, some cancers, etc., may cause abnormal taste in the mouth, or problems with taste perception. For example, diabetics often have a taste of rotten apples in their mouths. 6, drug side effects Many drugs may lead to bitterness in the mouth, causing abnormal taste sensation. For example, the common antihypertensive drug captopril and the drug rifampin for tuberculosis treatment. How to prevent bitterness in the mouth? Bitterness in the mouth may seem like a trivial matter, but it is actually a very delicate matter. Since we know the cause, then in life, it is recommended that we do these points: 1, pay attention to oral hygiene, learn the correct way to brush your teeth, and regular dental cleaning. (PS: the specific method of correct brushing can refer to the health kit series of articles – all these years you brush the right teeth?) Really bad breath and bitterness in the mouth, it is recommended to see a dentist to treat oral diseases. 2, for people under stress, you should try to make regular work and rest, reasonable food structure, and quit smoking and alcohol. The benefits of quitting smoking are definitely not just as simple as fresh breath. Quit smoking can also reduce the risk of lung cancer and oral cancer and many other cancers. 3, appropriate amount of vitamins and trace elements, daily life, eat more coarse grains, vegetables, fruits, appropriate amount of meat, eggs, dairy, balanced nutrition, in most cases can meet the needs of vitamins and trace elements. Insufficient, you can use complex nutrient tablets to supplement, but need to pay attention to the truth that too much is not enough, trace elements are also prone to problems. 4, appropriate exercise, choose walking, jogging, tai chi, swimming, etc., all help to promote the normal operation of digestive function, especially brain workers, exercise to strengthen, and to have regularity.