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.
If the sweating can be attributed to an underlying medical condition, it's called secondary hyperhidrosis. Health conditions that may cause excessive sweating include: 1  Diabetic hypoglycemia. 2  Endocarditis. 3  Fever of undetermined cause. 4  Generalized anxiety disorder. 5  Heart attack. 6  Heat exhaustion. 7  HIV/AIDS.