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头大 just means 'head is big' as in "头大没脑" (big head but no brain)

The common phrase is 头也大了 or 头都大了 . e.g. "英语太难了,学得我头也大了。"

The English expression "make my head spin" is a good counterpart of it

You can also simply say "my brain hurt"

头大 just means 'head is big' as in "头大没脑" (big head but no brain)

The common phrase is 头也大了 or 头都大了 . e.g. "英语太难了,学得我头也大了。"

The English expression "make my head spin" is a good counterpart of it

头大 just means 'head is big' as in "头大没脑" (big head but no brain)

The common phrase is 头也大了 or 头都大了 . e.g. "英语太难了,学得我头也大了。"

The English expression "make my head spin" is a good counterpart of it

You can also simply say "my brain hurt"

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source | link

头大 just means 'head is big' as in "头大没脑" (big head but no brain)

The common phrase is 头也大了 or 头都大了 . e.g. "英语太难了,学得我头也大了。"

The English expression "make my head spin" is a good counterpart of it