Hyperhidrosis (excessive sweating)

Sweating is a physiological body function that helps regulate body temperature when we are hot or do exercise. If your sympathetic nervous system is over-active, you may sweat more than you need to, for example, sweating when your body doesn't need to cool down.

There are two types of hyperhidrosis:

• Primary - This type is more common and the cause is not known. The condition can happen all the time, or every now and then. Usually, the condition starts when you are a child or teenager and may last all your life
• Secondary - this type causes sweating all over your body. It is usually caused by a disease that affects your endocrine (hormonal) system such as diabetes or having an over-active thyroid gland. It can also be caused by certain cancers, menopause and obesity.

How is hyperhidrosis treated?

There are several treatments for hyperhidrosis:

• Special antiperspirants - these address underarm hyperhidrosis by making sweat thicker which causes your pores to block
• Iontophoresis - uses a small electric current to stop sweat glands from working. However, the effect is only temporary and the treatment needs to be repeated at least every week
• Injections - block the nerves that control the sweat glands. The injections need to be repeated about every 3-6 months. The body can develop resistance to the drugs used, making the treatment less effective over time. There are risks associated with the long-term use of injections.
• Medication - oral medication to stop your sweat glands from being stimulated
• Thoracoscopic sympathectomy - a surgical procedure to cut or clamp the sympathetic nerves.