The reason your mind or brain hurts when thinking is because when you're thinking you're stressing out the muscles of your brain.
The more stress your muscles have put on them by thinking the more the brain or mind will hurt.
When thinking hard it strains your brain muscles as your muscles work in your brain when thinking and the harder you think the more the brain will hurt or even give you headaches.
You can also get what is referred to as tension headaches.
Tension headaches are the most common type of headache.
They can be brought on or triggered by things such as stress, depression, hunger, and muscle strain.
Tension headaches may come on suddenly or slowly.
Chronic tension headaches often occur along with other health problems such as anxiety or depression.
The most common type of headache is a tension headache (also called a muscle-contraction headache).
Tension headaches happen when stressed-out head or neck muscles squeeze too hard.
This causes pain often described as: feeling as though someone is pressing or squeezing on the front, back, or both sides of the head.