Man pushing a sled with weights in car park, head sweats
a man and a woman stretching, excessive backsweat

It could be medical...

Sometimes, excessive sweating from the head and face can be put down to a medical condition called craniofacial hyperfidrosis, which is caused by overactive sweat glands.

Another condition is secondary hyperhidrosis. This can be caused by the side effects of medication, a change in your hormone levels, or damage to the body's nervous system. If you think your head sweating is being triggered by any of these it's important you talk to your doctor, to pinpoint the actual cause.

Pretty girl behind plant
A collection of laboratory test tubes with colored liquid inside