There is no recent evidence to suggest that hypothyroidism causes dehydration. However, there appears to be an association between hypothyroidism and electrolyte levels, which play an important role in fluid balance in the body.
Electrolytes are minerals that are present in bodily fluids. An imbalance of electrolytes can interfere with normal bodily functions and lead to severe complications.
Examples of electrolytes
According to a 2021 research review, previous research found that severe hypothyroidism was associated with:
Sodium is an electrolyte responsible for balancing the body’s water content. It helps maintain extracellular fluid volume, which refers to bodily fluids not contained within the cells and makes up
If sodium levels are too low, the water moves into the cells, causing them to swell. This can lead to life threatening complications.
Symptoms of hypothyroidism include:
- tiredness
- unintended weight gain
- difficulty tolerating the cold
- muscle and joint pain
- irregular or heavy menstrual periods
- depression
- dry skin
- dry, thinning hair
Although dehydration is not a symptom of hypothyroidism, and there is no research to suggest hypothyroidism causes dehydration, persistent thirst can be a symptom of hyperthyroidism (overactive thyroid).
Other symptoms of hyperthyroidism include:
- irregular or rapid heartbeat
- weight loss despite an increase in appetite
- shaky hands
- muscle weakness
- frequent bowel movements
- a goiter, which is an enlargement in the neck
- sweating
- difficulty tolerating the heat
- mood changes, such as nervousness and irritability
- difficulty sleeping
- fatigue
If a person is concerned that they are experiencing symptoms of either hypothyroidism or hyperthyroidism, they should contact a doctor. They should also contact a doctor if they are experiencing symptoms of dehydration. Symptoms include:
- thirst
- dark yellow urine
- strong-smelling urine
- urinating less frequently
- tiredness
- dizziness
- dry mouth, tongue, and lips
- sunken eyes
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