The feeling of having a dry mouth is a common discomfort that can stem from many different causes. One of the conditions that deserves particular attention is diabetes, which often includes so-called xerostomia among its symptoms.
Diabetes mellitus is one of the most widespread diseases worldwide and, according to the World Health Organization, affects more than 340 million people. The most common symptoms of diabetes include an uncontrollable increase in hunger and thirst, a general sense of malaise, and – when blood tests are performed – elevated blood sugar levels. In people with diabetes, glucose metabolism is impaired due to insufficient (or absent) production of the hormone responsible for this process: insulin.
Some complications of diabetes are well known and routinely monitored, such as vision problems or issues related to peripheral circulation. However, the oral cavity can also be affected. This often results in infections of the oral mucosa or, indeed, xerostomia.
In general, dry mouth can be caused by reduced saliva production by the salivary glands or by changes in the composition of the saliva itself. In the case of diabetes, both factors contribute to the discomfort affecting the oral mucosa.
What’s the connection between diabetes and dry mouth?
Dry mouth is a very common condition, affecting up to one-third of the population. However, in people with type 1 and type 2 diabetes, the incidence of xerostomia increases significantly, reaching as high as 50% of diabetic patients.
For people with diabetes, a true vicious cycle develops: high blood sugar levels lead to similarly high glucose concentrations in the saliva. Harmful microorganisms that naturally live in the mouth (usually kept in check by the immune system and by saliva) feed on sugars. When faced with an especially abundant “buffet,” they proliferate, leading to conditions such as stomatitis or oral thrush. In addition, the presence of these pathogenic microorganisms increases the acidity of the oral cavity; without the buffering effect of saliva, this acidity damages the tooth enamel.
There are several causes behind dry mouth in people with diabetes, and all should be considered as part of proper disease management.
Diabetic patients are more prone to dehydration. In diabetes, glucose tends to build up in the bloodstream. The kidneys are therefore forced to “work overtime” to filter and absorb this excess sugar. If diabetes is not properly controlled with the right treatment, the kidneys may struggle to perform this task: excess glucose is expelled through the urine, drawing additional fluids from body tissues through osmosis. This leads to dehydration, which is further aggravated by the tendency toward more frequent urination in people with diabetes.
Over time, this overload can impair kidney function. In fact, one of the most common complications of diabetes is progressive kidney failure. If untreated, kidney failure can result in severe renal impairment; even in its early stages, however, it disrupts the body’s ability to manage fluids and can contribute to the sensation of dry mouth.
Another major warning sign – and one of the most serious conditions linked to diabetes – is elevated blood sugar levels. Hyperglycemia carries several risks, including long-term vision loss. But even in its earlier stages, excess blood sugar can lead to high concentrations of glucose in saliva as well. As a result, people with poorly controlled diabetes are more vulnerable both to xerostomia as a symptom of hyperglycemia and to conditions that include dry mouth among their manifestations. For example, oral candidiasis (or thrush) thrives in sugar-rich environments… which can be particularly concerning for people with diabetes.
Finally, some medications used to treat diabetes may also list dry mouth as a side effect.
How to Relieve Dry Mouth When You Have Diabetes
A persistent feeling of dry mouth is one of the symptoms that may indicate diabetes. Therefore, if the discomfort doesn’t improve with a few simple measures, it’s advisable to consult a doctor for further evaluation.
In cases where diabetes has already been diagnosed, the first essential step is adhering to the treatment plan prescribed by a specialist. Taking insulin and other medications used to control blood sugar levels as directed is the foundation for maintaining overall health – and, consequently, oral health as well.
People with diabetes can also adopt healthy habits – always under medical supervision – that help keep the mouth properly hydrated. These include limiting salty or spicy foods and caffeine, avoiding smoking, and paying special attention to oral hygiene. As we’ve seen, the mouth is particularly vulnerable in diabetes, so extra care is often needed.
While certain medications can stimulate saliva production, quick relief from the burning sensation of dry mouth can also be achieved through simple, natural remedies – such as oral sprays like Cariex®. Oral sprays made with natural ingredients, such as baking soda to reduce acidity, xylitol to support dental health, and hyaluronic acid – an intensely hydrating molecule naturally present in our cells – provide fast and soothing comfort. When in doubt, it’s always best to seek professional advice. Living well with diabetes is absolutely possible, and keeping your mouth healthy is everyone’s right.