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Pregnancy
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Any heart or circulatory disorder or disease
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High or low blood pressure
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Severe respiratory conditions such as asthma or chronic obstructive pulmonary disease (COPD)
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Cold urticaria
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Peripheral vascular disease
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Peripheral neuropathy
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Recent heart attack
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Severe anaemia
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Epilepsy or history of seizures
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History of psychosis or schizophrenia
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Diabetes
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Prone to dizziness or fainting
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Heat intolerance or heat-related conditions
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Sensitivity to cold temperature or cold-related conditions