- Source: Heat intolerance
Heat intolerance is a symptom characterized by feeling overheated in warm environments or when the surrounding environment's temperature rises. Typically, the person feels uncomfortably hot and sweats excessively.
Compared to heat illnesses like heatstroke, heat intolerance is usually a symptom of endocrine disorders, drugs, or other medical conditions, rather than the result of too much exercise or hot, humid weather.
Symptoms
Feeling subjectively hot
Sweating, which may be excessive
In patients with multiple sclerosis (MS), heat intolerance may cause a pseudoexacerbation, which is a temporary worsening of MS-related symptoms.
A temporary worsening of symptoms can also happen in patients with postural orthostatic tachycardia syndrome (POTS) and dysautonomia.
Diagnosis
Diagnosis is largely made from the patient history, followed by blood tests and other medical tests to determine the underlying cause. In women, hot flashes must be excluded.
Causes
Excess thyroid hormone, which is called thyrotoxicosis (such as in cases of hyperthyroidism), is the most common cause.
Other causes include:
Amphetamines along with other types of stimulant medications, such as appetite suppressants
Anticholinergics and other drugs that can impair sweating
Caffeine
Malignant hyperthermia susceptibility
Menopause
Multiple sclerosis
Fibromyalgia
Diabetes
Hypothalamic tumors
Methadone treatment
Dysautonomia
Postural orthostatic tachycardia syndrome (POTS)
Sensory defensiveness/sensory processing disorder
Serotonin syndrome
Treatment
Treatment is directed at making the affected person feel more comfortable, and, if possible, resolving the underlying cause of the heat intolerance.
Symptoms can be reduced by staying in a cool environment. Drinking more fluids, especially if the person is sweating excessively, may help.
Cooling vests can be used as a preventative tool to reduce a person's body temperature or when symptoms present to feel more comfortable.
References
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- Heat intolerance
- Exercise intolerance
- Postural orthostatic tachycardia syndrome
- Hyperthyroidism
- Cholinergic urticaria
- Orthostatic intolerance
- Graves' disease
- Goitre
- Thyroid
- Exercise-induced nausea
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