Hyperhidrosis is a condition characterised by abnormally increased sweating, in excess of that required for regulation of body temperature. Hyperhidrosis can either be generalised or localised to specifc parts of the body, such as hands, feet and axillae. Hyperhidrosis can be divided into primary or idiopathic, and a secondary type. The primary type usually starts during adolescence or even earlier, while secondary hyperhidrosis can start at any point in life. The latter form may be due to a disorder of the thyroid or pituitary gland, diabetes mellitus, tumours, gout, menopause, or certain medications. This article highlights the clinical features and the treatment options for this condition.