Hyperhidrosis is a medical condition characterized by excessive sweating beyond what is necessary to regulate body temperature. It can affect specific areas like the palms, feet, underarms, or face, or occur throughout the body. Primary hyperhidrosis has no clear cause, while secondary hyperhidrosis results from underlying conditions such as infections, hormonal imbalances, or medication use. Treatments range from antiperspirants and oral medications to more advanced options like Botox injections, iontophoresis, or surgery.