When people come in contact with poison ivy, the urushiol can cause an allergic skin reaction that produces reddish, itchy, and painful inflammation of the skin (dermatitis). Close relatives of poison ivy plants that produce similar dermatitis symptoms are poison oak and poison sumac.
Health conditions that may cause excessive sweating include: 1  Diabetes. 2  Endocarditis. 3  Fever of undetermined cause.  Generalized anxiety 1  disorder. Hiatal hernia.  Heat 1  exhaustion. HIV/ 2 AIDS. Hyperhidrosis.  Hyperthyroidism (overactive 1  thyroid) 2  Leukemia.  Malaria.
A variety of other factors can cause excessive sweating, including underlying medical conditions and medicines, for instance: 1  Frey's syndrome is a condition in which sweating occurs from just one side of the face when certain foods are eaten.2  It occurs after surgery on, or injury near, the saliva-producing glands. variety of other factors can cause excessive sweating, including underlying medical conditions and medicines, for instance: 1  Frey's syndrome is a condition in which sweating occurs from just one side of the face when certain foods are eaten.