There is usually a genetic predisposition to it. The possibilities
for incresed sweating are anxiety, Lymphoma, Infections like Brucellosis, Pheochromocytoma, Carcinoid syndrome and Hyperthyroidism. Also indigestion may result in sweating due to acid reflux disease.
You can use deodorants, talc, avoid contact with hot things, have lot of water, use loose cotton clothes, have cool foodstuffs in daily routine like curd, juice etc.