THE centre of the tongue indicates the most about the digestion history of a person. To understand the state of the heart, look way back at the root of the tongue for redness. If the tongue is very pale, it indicates a very high fever is imminent and the coating would be white. If the tongue is a reddish purple especially around the tip, the person may or may not have a heart problem. But that needs to be investigated.

Modern medicine notes that some tongue diseases include:
• Loss of taste
• Sore tongue
• Black hairy tongue
• Glossodynia
• Benign migratory glossitis
• Tongue-tie

Loss of taste

Taste is a chemical sense that is activated during eating and drinking. Reasons for a loss of taste include:
• A person may lose their sense of taste if the facial nerve is damaged in some way. For example, Bell’s palsy may stop the facial nerve working properly and prevent or reduce chewing function (and, therefore, alter taste). It is uncommon for every taste nerve (bitter, salty, sweet and sour) to be affected.
• The autoimmune disorder known as Sjogren’s syndrome causes reduced saliva production, which in turn reduces the sense of taste. This is because the taste buds can only detect flavour when food is properly mixed with saliva.
• Glossodynia, a condition characterised by a burning sensation on the tongue, is also linked to loss of taste in some cases.
• Some medications can result in an unpleasant metallic taste in the mouth, such as tetracycline (an antibiotic), lithium carbonate (an antipsychotic) and captopril (an antihypertensive).

Sore tongue

A sore tongue is usually caused by some form of trauma, such as biting your tongue, or eating piping-hot or highly acidic food or drink. Other causes of a sore tongue include:
• If your top and bottom teeth don’t fit neatly together, tongue trauma is more likely.
• Some people may experience a sore tongue from grinding their teeth (bruxism).
• Disorders such as diabetes, anaemia, some types of vitamin deficiency and certain skin diseases can include a sore tongue among the range of symptoms.
• A sore tongue can be caused by disorders including black hairy tongue.

Black hairy tongue

While the term ‘black hairy tongue’ suggests the tongue surface looks black, it may also be dark yellow, brown, green or white. The tongue papillae are constantly renewing themselves and, usually, the old cells are shed as the new cells emerge. Black hairy tongue, a comparatively rare condition, is caused by the failure of the old cells to shed. The overgrowth of papillae trap food and bacteria, which create the characteristic dark
The ‘coat’ on the tongue’s surface, while the tongue looks furred because of the layering of unshed papillae. The cause isn’t known, but risk factors include:
• Poor oral hygiene
• Cigarette smoking
• Particular antibiotics
• Chemotherapy and radiation treatment for cancers of the head and neck
• Poorly managed diabetes.

Glossodynia

The main symptom of glossodynia is a burning sensation on the tongue surface. The various causes of glossodynia can include:
• Local infections, such as oral thrush (candidiasis)
• Damage to the lingual nerve
• Damage to nerves of the mouth during dental extractions
• Cigarette smoking
• Vitamin deficiencies
• Particular medications, such as diuretics and some blood pressure drugs.

Benign migratory glossitis

This condition is characterised by irregular and inflamed patches on the tongue surface that often have white borders. The tongue may be generally swollen, red and sore. Another name for this condition is geographic tongue. The cause of benign migratory glossitis is unknown, but risk factors are thought to include:
• Mineral or vitamin deficiencies
• Local irritants, such as strong mouthwashes, cigarettes or alcohol
• Certain forms of anaemia
• Infection
• Certain medications
• Stress.

Tongue-tie

The medical name for tongue-tie is ankyloglossia. Frenula are little strings of tissue found underneath the tongue, inside the cheeks near the back molars, and under the top lip. The frenum (or frenulum) under the tongue is called the lingual frenum. Tongue-tie is a condition characterised by a short frenum that stops the tongue from poking out past the lips. Other symptoms can include:
• Tongue tip can’t touch the roof of the mouth
• Tongue can’t be moved sideways
• Tongue tip may look flat or square instead of pointy when the tongue is extended
• Tongue tip may be notched or heart-shaped