Why am I very thirsty and my mouth is dry?


The sensation of thirst is our body's way of notifying us of the need to hydrate ourselves by ingesting sufficient amounts of liquids, especially water. We do not always feel it with the same intensity. In times when temperatures are higher or when we do intense physical activity, which increases sweating, we are thirstier and it is absolutely normal, but there are times when, without there being an objective cause, we have more need to drinking water. Excessive thirst can have various causes, including being a symptom of some pathology that may require a change in diet or medical treatment.

Why am I very thirsty and my mouth is dry

Food and diet

If at a certain moment it seems to you that you are drinking an abnormal amount of water because your body asks for it, ask yourself about your last meals. Of course, foods with a lot of salt and also those that contain plenty of spices cause thirst, but they are not the only ones. A diet in which foods with low water content predominate, such as nuts, chocolate, sausages or very cured cheeses and in which juicy fruits (melon, watermelon, pineapple) and vegetables are scarce, it may be behind that thirst that cannot be quenched. In addition, an excess of foods rich in fats and sugars, as well as an excessive intake of alcoholic beverages. They can cause a certain degree of dehydration in the body. Getting more fluids by changing your dietary guidelines may be the solution to stop being so thirsty.

Drugs and medical treatments

Some treatments, especially those needed to fight cancer, such as chemotherapy or radiation therapy, can have extreme thirst and dry mouth as a side effect. Certain drugs, especially diuretics, anticholinergics and antihistamines, can also be behind xerostomia or dry mouth, which can not only imply a feeling of thirst, but also decreased salivation. In this case, a medical consultation is necessary in case any modification in the medication regimen is necessary.

Fever and digestive system disorders

They are two frequent causes that, at a certain moment, we are very thirsty. The increase in body temperature, which usually accompanies an infectious process that triggers fever, makes the body demand more fluids to try to stop it. Also, an episode of vomiting and/or diarrhea, involving sudden fluid loss, causes thirst as an immediate way of rehydration. In these cases, thirst is normal and good because our body remembers that we need fluid intake to recover from this type of temporary condition.

If this is your case, we recommend this other article from on How to lower a fever at home.

Why I am very thirsty and my mouth is dry - Fever and dysfunctions of the digestive system

stress and anxiety

Having a dry mouth, feeling that we lack saliva even to swallow and even to vocalize correctly, is something that can occur in a situation of continued stress or at a specific moment of special anxiety. In this case, it is important to avoid situations that trigger this exaggerated nervousness. The intake of relaxing infusions such as: linden, valerian or chamomile is a good remedy, since, in addition to moisturizing, they will help reduce dry mouth due to anxiety.

We recommend you consult this article on How to control anxiety and stress.

Possible diabetes or kidney dysfunction

Excessive thirst, which lasts for no reason, can be one of the first warning signs of some type of undiagnosed diabetes, especially if, as the American Mayo Clinic points out [1], that thirst is accompanied by other symptoms such as: increased urination, tiredness, tingling in the extremities or blurred vision among others. Blood glucose levels that are too high increase the filtering work of the kidneys and cause an increase in urination to try to expel excess sugars through the urine, something that, in turn, causes more thirst in a ‘vicious circle. ‘. In addition to diabetes, thirst and urination disturbances may be indicative of some degree of kidney dysfunction., so medical consultation is necessary.


Significant blood loss for any reason, from very heavy menstrual bleeding to blood loss from an injury, can trigger the need to drink more water until the body returns to its normal water levels. The same happens after certain surgical interventions. A lot of thirst and dry mouth are common symptoms in a postoperative period, which, progressively, must be regulated.


Sometimes a deficiency or, on the contrary, an excess of certain minerals that perform important functions in the body can manifest itself with an abnormal thirst. This is what is known as an electrolyte imbalance. Electrolytes are the minerals (ions) present in the blood and other body fluids. Its imbalance or massive loss can cause thirst. The clearest example is the thirst we feel when playing sports and sweating, since they are eliminated through sweating. This is normal, but there are other more serious imbalances, such as the one that occurs when the level of calcium in the blood is higher than normal. It is what is known as hypercalcemia, a mismatch that can become really serious, especially if the thirst is accompanied by other symptoms such as abdominal pain.


Leave a Reply