What Causes Excessive Underarm Sweating?

There are several causes for underarm sweating. The most common cause is hyperhidrosis as a result of an overactive sweat gland (apocrine). Other causes include:

hyperthyroidism – excessive thyroid activity leading to high levels of the hormone thyroxine which affects the nervous system and can increase secretions from glands, such as apocrine glands in the armpits and penis. This may be due to other symptoms related to hyperthecosis such as palpitations or irregular heartbeat; it also occurs in people with Graves disease who have raised levels of thyroid-stimulating hormones (TSH)

– excessive thyroid activity leading to high levels of the hormone thyroxine which affects the nervous system and can increase secretions from glands, such as apocrine glands in the armpits and penis. This may be due to other symptoms related to hyperthecosis such as palpitations or irregular heartbeat; it also occurs in people with Graves disease who have raised levels of thyroid-stimulating hormones (TSH) diabetes mellitus – excessive secretion by nerves that control body temperature, blood sugar regulation and nerve impulses resulting from damage caused by diabetes mellitus. Excessive sweating is usually seen on both hands but can affect only one side if there is damage at another point along that nerve pathway. In addition, this condition has been associated with autonomic neuropathy causing either no sweating or absent/low sweat production on any part affected by autonomic lesions [3

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