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.
Feeling Sick Can Cause Sweating. Being sick can make you sweat, and not just because you have a fever. Sweating can be a symptom of angina -- heart-related chest pain -- and a heart attack. Infections, diabetes, and an overactive thyroid gland all can make you sweat. Some diseases, like cancer and HIV, can cause night sweats.