It is not known what causes primary<unk> . One theory is that<unk>  results from an overactive sympathetic nervous system, but this hyperactivity may in turn be caused by abnormal brain function.
Some patients afflicted with the condition experience a certain degree of reduction in their quality of life, depending on how severe their condition is.  Sufferers feel at a loss of control because perspiration takes place independent of temperature and emotional state.
However, anxiety can exacerbate the situation for many sufferers.  A common complaint of patients is that they get nervous because they sweat, then sweat more because they are nervous.  Other factors can play a role; certain foods & drinks, nicotine, caffeine, and smells can trigger a response (see also diaphoresis).
Hyperhidrosis pathophysiology
Hirsutism pathophysiology
Hyperhidrosis causes
Sheehan's syndrome pathophysiology
Insomnia etiology
Amaurosis fugax pathophysiology
Dizziness pathophysiology
Pituitary apoplexy pathophysiology