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Sweat is your body's temperature regulator. Severe underarm sweating is usually due to overactive sweat glands.
In severe primary axillary hyperhidrosis, sweating significantly exceeds the body's normal requirements for cooling. Sometimes excessive sweating is due to other medical causes.
As with any medical condition, a diagnosis must first be made to exclude and treat any underlying cause. Diagnosis is usually made on the clinical picture but sometimes further testing is necessary.