I sweat too much durring and after exercise. WHY?

this is weird, but it never happened like this. usually after badminton practice there maybe some damp spots around the collar of my shirt and occasionally sweat runs down my face, but recently it became irritable and noticeable when i sweat down my cheeks and airs, sometimes it even fogs my gles! are my sweat glands over working themselves just to cool my body off? WHY?????